Due to the imperfect development of the cerebral cortex function of infants, eating often cause gastro-colonic reflex, produce stool, so the number of stools is more than adults. The pylorus of the stomach opens soon after breastfeeding, and the contents of the stomach enter the duodenum one after another, thus causing the baby to feel hungry.
Gastric-colonic reflex is manifested as strong peristalsis in the colon after food enters the empty stomach, and the contents of the colon are sent into the rectum and cause defecation reflex. Because the cerebral cortex of infants and young children is not yet mature, defecation action is not controlled, so once there is a desire to defecate, the stool is discharged from the body.
Stomach capacity in the newborn is about 30 ~ 60ml, 1 ~ 3 months 90 ~ 150ml, 1 year old 250 ~ 300ml. eating milk soon after the pylorus is open, stomach contents into the duodenum, stomach emptying time with different types of food, such as water emptying time for 1.5 ~ 2 hours, breast milk 2 ~ 3 hours.
To summarize, the baby eat full on the poop, poop and then want to eat is normal, but if the baby appeared irritable, weight gain, etc., must promptly consult the doctor to find out the cause, under the guidance of the doctor to deal with or treatment.