How long should a 1.5-month-old infant sleep during the day normally?

A one-and-a-half-month-old infant typically sleeps about 3–4 hours during the day, although the exact duration varies from baby to baby.

About a month after birth, infants begin regulating their sleep based on light intensity, gradually establishing a day-night sleep pattern—a crucial developmental stage. At one and a half months of age, babies tend to sleep less during the day (around 3–4 hours) and more at night, increasing nighttime sleep to 9–10 hours. During this period, parents should encourage babies to fall asleep independently, which significantly impacts their development. Insufficient sleep or frequent awakenings may be related to factors such as hunger, breathing difficulties, or unstable body temperature. Therefore, if an infant is not getting enough sleep, it's important to consult a pediatrician or healthcare provider to determine whether underlying issues are preventing sleep.

It is recommended that caregivers regularly check on sleeping infants to ensure they are properly covered and that no foreign objects are blocking their airways. When the baby wakes up in good spirits, engaging in interactive activities can help promote healthy development.