What is the reason for a 4-month-old baby crying after waking up?

Patient's question:

My child is 4 months old. Recently, they have been sleeping very little, about 1 hour during the day and waking up every 1.5 hours at night. When they wake up, they cry but eat little, and they fall asleep when held but cry when put down. We are very anxious and hope for a good solution.

Doctor's answer:

In this situation, don't get impatient. You should carefully analyze the reason. First, consider whether the baby is sleeping too much during the day. Generally, infants under 6 months old sleep 3-4 times during the day, with each nap lasting 1.5-2 hours; infants aged 7-12 months sleep 2-3 times during the day, with each nap lasting 2-2.5 hours. Sleeping too long during the day will inevitably affect nighttime sleep. If the baby sleeps too much during the day, parents can consciously wake the baby up or play with him for a longer period. Through a few days of adjustment, the baby will gradually develop the habit of sleeping less during the day and sleeping longer at night.

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