It is normal in most cases for 70-day-old babies to sleep as soon as they are fed. Breastfeeding is a very physically demanding activity, and babies are prone to sleep after breastfeeding due to fatigue as a result of their underdeveloped brain and low excitability of the cerebral cortex and nerve cells. Newborns spend about 20 hours a day in sleep, adequate sleep is conducive to the growth and development of the baby’s organs and tissues. As babies get older, the cerebral cortex gradually develops and matures, and only then does the alternation between sleep and wakefulness occur gradually, and its sleep time is relatively shortened. 70 days the baby sleeps about 18 hours a day, after eating, the body consumes more energy, very fatigue, and at the same time snuggled in the mother’s warm embrace, quiet and comfortable environment, it is easier for babies to fall asleep. If your baby sleeps as soon as he/she is fed, accompanied by other discomforts, not easy to wake up or depressed, it is recommended to seek medical attention promptly.