Babies sleep better after enjoying breast milk in the evening - whether pumped or fresh. Image: Ken Hammond, USDA, Wikipedia.
Read aloud A baby should get pumped breast milk at the time of day it is also made, Spanish researchers suggest. The reason: The milk produced during the day is composed differently than the one produced during the night. The latter contains, for example, larger amounts of substances that promote sleep, while in the former, more stimulating ingredients can be found. So it makes no sense to pick up milk in the morning until the evening and then feed the baby with it, conclude the researchers around Cristina Sánchez from the University of Extremadura. Breastmilk is a very complex mixture of various nutrients, vitamins, minerals, trace elements, immune factors, hormones and other biologically active substances. Their composition changes as the baby grows to best fit the needs of the baby. But apparently not only the age of the child plays a role in the mix, but also the time of day, the Spaniards could now prove. They examined six to eight breast milk samples from 30 women who had been pumped out over a 24-hour period, focusing specifically on the amount of so-called nucleotides. These biomolecules are the building blocks of the genetic material, but also fulfill other functions in the body. Some of them are sleep-inducing and reassuring, while others seem to be more stimulating.

The concentration of sleep-inducing variants? Called AMP, GMP and UMP? followed a daily cycle and reached the highest values ​​between eight o'clock in the evening and eight o'clock in the morning, the scientists discovered. In contrast, the nucleotides CMP and IMP, which are considered to be stimulating, were the most concentrated during the day. This change is apparently helping to initiate the sleep phase in the evening, study director Cristina Sánchez comments: "One would not give anyone coffee at night, and the same seems to apply to breastmilk? it has special parts of the day that stimulate activity in the child, and extra night-time components that help the baby rest. "So it's very important to give the baby the milk at exactly the time of day when it was pumped out, emphasizes the scientist.

Cristina Sánchez (University of Extremadura) et al .: Nutritional Neuroscience, Vol. 12, No. 1, p. 2 ddp / science.de - Ilka Lehnen-Beyel

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