Sometimes Less Is More: How Giving Babies Slightly Less Fluid May Help Them Breathe Easier After Birth

A plain-language look at a new randomized study testing restricted versus standard intravenous fluids in newborns with transient tachypnea (a common, short-lived breathing problem)

Many babies, especially those born by cesarean, breathe fast and work hard to breathe in their first hours of life because fluid that filled their lungs before birth has not yet fully cleared. This common and usually short-lived condition is called transient tachypnea of the newborn, and a new randomized study found that giving these babies a carefully reduced amount of intravenous fluid — rather than the usual amount — helped their lungs recover about a day faster and let them reach full milk feeds sooner, with no signs of dehydration or other harm [1]. It is an encouraging example of how a simple, low-cost change can sometimes do more than medicines.

Why some babies breathe fast at birth

Before birth, a baby's lungs are not filled with air but with a special fluid the body makes on purpose; this fluid helps the lungs grow. In the last hours before a vaginal birth, labour sends a surge of natural stress hormones through the baby, and these hormones flip a switch in the lung so that it stops making fluid and starts soaking it back up, clearing the tiny air sacs so the baby can breathe air [2]. When a baby is born by planned cesarean before labour has really begun, that hormone surge is smaller, so more fluid stays behind in the lungs [3]. Doctors have long noticed that it is the combination of being born by cesarean and being born a little early that most raises the chance of this breathing trouble [4]. The result is a baby who breathes rapidly, grunts, and may need extra oxygen or gentle breathing support for a day or two. It is the most common reason full-term and near-term babies have breathing difficulty after birth [5], and although it nearly always gets better on its own, it still leads to many admissions to newborn units.

An old routine that had not really been tested

For a long time, care for these babies was purely supportive: keep them comfortable, give oxygen or gentle breathing help if needed, and provide fluids through a vein until they are ready to feed. The amount of intravenous fluid was set by general rules for what any newborn needs — not by the fact that these particular babies already had too much fluid sitting in their lungs. That raised a natural question that went surprisingly unexamined for years: if the problem is leftover fluid, might giving a bit less fluid help the lungs dry out faster?

A handful of small studies began to explore this. One early trial found that babies given less fluid needed breathing support for a shorter time and cost less to care for [6]. Another reported that a reduced fluid amount was safe and shortened the illness [7], and a third found shorter breathing support with restriction in late-preterm and term babies [8]. But these studies were small, and when experts pooled them together they concluded the evidence was too weak to change standard practice and that better studies were needed [9]. A broad review of all the treatments tried for this condition reached a similar conclusion: nothing had been proven to work well [10]. This new study set out to give the fluid question a more careful test.

What the researchers did

The study was carried out at a single newborn intensive care unit in Malatya, Turkey, between 2021 and 2023 [1]. It included babies born at 34 weeks of pregnancy or later who had this breathing problem and needed gentle breathing support through soft prongs in the nose. Within the first two hours after birth, each baby was randomly assigned — like a coin toss — to receive either a reduced amount of intravenous fluid or the usual standard amount. The reduced amount was roughly two-thirds to three-quarters of the usual: for example, on the first day, more mature babies received 40 instead of 60 units of fluid per kilogram of body weight, and slightly younger babies received 50 instead of 70. Everything else about the babies' care, including the breathing support settings, was kept the same in both groups, so that any difference in how they did could be credited to the fluid amount and nothing else. Fifty babies took part, and 44 were included in the final results after a few were found to have other conditions.

What they found

The babies given less fluid did better on the two measures that matter most day to day. They came off breathing support roughly a day sooner — about 36 hours on average, compared with about 57 hours in the standard group [1]. They also reached full milk feeds much earlier, at about 65 hours versus 94 hours. Babies in the reduced-fluid group went home a little sooner too, but that particular difference was small enough that it could have been down to chance.

Just as important, the reduced-fluid approach looked safe. Doctors watched closely for the very problems that make people nervous about giving less fluid — dehydration, low blood sugar, and kidney strain — and found none of them. The babies kept making plenty of urine, their kidney blood tests stayed normal, and none developed low blood sugar. A small number of babies in both groups had a modest rise in blood salt levels around day three, which is why the doctors checked blood tests and daily weights carefully. Babies on less fluid lost a little more weight in the first days, but this stayed within the normal, expected range. There were no serious complications and no deaths in either group [1].

Why giving less fluid might help

It can seem backwards to help a baby by giving less fluid, so it helps to picture what is happening inside the lungs. The tiny air sacs and the surrounding tissue are a bit like a sponge that needs to wring itself out after birth so air can move in and out easily [2]. If the body is also handling a large amount of extra fluid arriving through the vein, that sponge stays soggy for longer, and the drainage system that carries fluid away from the lungs has more work to do. By trimming the incoming fluid to a carefully chosen lower amount — not starving the baby, just easing off the excess — the team gives the lungs a better chance to dry out and recover on their own. This is not a brand-new idea; earlier small studies had hinted the same thing [6][7][8], but they were not large or careful enough to be sure. The value of this new study is that it tested the idea head to head, with everything else kept equal, and saw a clear, sensible benefit.

What this means for families

If your baby is born with this kind of breathing trouble, this study offers a reassuring and hopeful message: the team may be able to help the lungs clear faster simply by fine-tuning the amount of fluid your baby receives, without any new medicine or procedure. It also shows why newborn teams watch details like daily weights and blood salt levels so closely — those checks are exactly what makes a slightly reduced-fluid approach safe. It is also a good reminder that the intravenous fluid a baby receives is an active part of treatment, not just background support, and that the amount can be thoughtfully tailored to what each baby needs rather than set by a single rule. If you have questions, it is always reasonable to ask your baby's team how they are managing fluids and feeding and what signs they are watching for. It is worth knowing that this was one small study from a single hospital, and that it focused on otherwise uncomplicated cases, so it is not the final word and would not apply to babies who are more seriously ill [1]. Doctors will still judge each baby individually, weighing this new evidence alongside everything else they know about your child.

One reason researchers are excited about the fluid idea is that several medicines tried for this condition simply have not worked. A breathing medicine called salbutamol, similar to an asthma inhaler, seemed promising in theory but has not shortened the illness in careful studies [11], and a recent well-run trial again found it made no difference [12]. Against that backdrop, a free and simple adjustment to fluids that fits what we understand about the biology is especially appealing. What researchers are working on next is a larger study across many hospitals, with extra safeguards, to confirm these findings and to learn whether the same approach can safely help babies with more complicated forms of the condition. If it holds up, one of the oldest routines in newborn care — how much fluid to give — may be due for a gentle rewrite.

References

  1. Gökçe İK, Turgut H, Kaya H, Deveci MF, Akbaş M, Özdemir R. Efficacy and Safety of Restricted Fluid Therapy in Transient Tachypnea of the Newborn: A Randomized Controlled Study. BMC Pediatr. 2026. doi:10.1186/s12887-026-07303-6 ↩
  2. Jain L, Eaton DC. Physiology of fetal lung fluid clearance and the effect of labor. Semin Perinatol. 2006;30(1):34–43. doi:10.1053/j.semperi.2006.01.006 ↩
  3. Hansen AK, Wisborg K, Uldbjerg N, Henriksen TB. Risk of respiratory morbidity in term infants delivered by elective caesarean section: cohort study. BMJ. 2008;336(7635):85–87. doi:10.1136/bmj.39405.539282.BE ↩
  4. Riskin A, Abend-Weinger M, Riskin-Mashiah S, Kugelman A, Bader D. Cesarean section, gestational age, and transient tachypnea of the newborn: timing is the key. Am J Perinatol. 2005;22(7):377–382. doi:10.1055/s-2005-872594 ↩
  5. Edwards MO, Kotecha SJ, Kotecha S. Respiratory distress of the term newborn infant. Paediatr Respir Rev. 2013;14(1):29–36. doi:10.1016/j.prrv.2012.02.002 ↩
  6. Stroustrup A, Trasande L, Holzman IR. Randomized controlled trial of restrictive fluid management in transient tachypnea of the newborn. J Pediatr. 2012;160(1):38–43.e1. doi:10.1016/j.jpeds.2011.06.027 ↩
  7. Dehdashtian M, Aramesh MR, Melekian A, Aletayeb MH, Ghaemmaghami A. Restricted versus standard maintenance fluid volume in management of transient tachypnea of newborn: a clinical trial. Iran J Pediatr. 2014;24(5):575–580. PMC4359410 ↩
  8. Sardar S, Pal S, Mishra R. A randomized controlled trial of restricted versus standard fluid management in late preterm and term infants with transient tachypnea of the newborn. J Neonatal Perinatal Med. 2020;13(4):477–487. doi:10.3233/NPM-190400 ↩
  9. Gupta N, Bruschettini M, Chawla D. Fluid restriction in the management of transient tachypnea of the newborn. Cochrane Database Syst Rev. 2021;2:CD011466. doi:10.1002/14651858.CD011466.pub2 ↩
  10. Bruschettini M, Hassan KO, Romantsik O, Banzi R, Calevo MG, Moresco L. Interventions for the management of transient tachypnoea of the newborn — an overview of systematic reviews. Cochrane Database Syst Rev. 2022;2:CD013563. doi:10.1002/14651858.CD013563.pub2 ↩
  11. Moresco L, Bruschettini M, Macchi M, Calevo MG. Salbutamol for transient tachypnea of the newborn. Cochrane Database Syst Rev. 2021;2:CD011878. doi:10.1002/14651858.CD011878.pub2 ↩
  12. Dhaka A, Kumar S, Singh P, Priyadarshi M, Chaurasia S, Bhat NK, Basu S. Nebulized salbutamol for the treatment of transient tachypnea of the newborn: a randomized controlled trial. J Perinatol. 2025;45(11):1595–1600. doi:10.1038/s41372-024-02201-0 ↩