It's common for babies to cry when put down for sleep.
During your baby's first month, avoid letting him or her cry. Soothe your baby by singing quietly, playing soft music or rocking him or her gently.
At age 4 months, if your baby cries after being placed in the crib, check on him or her and offer comforting words. Then leave the room and give him or her time to settle again. You might also consider putting your baby down for a nap a little earlier. This might allow your baby to get past some fussiness by the time his or her nap is supposed to start.
Also, keep in mind that babies are often active during sleep — twitching their hands and feet, smiling, startling, and generally appearing restless. It's easy to mistake a baby's stirrings as a sign that he or she is waking up or needs to eat. Instead of picking up your baby right away, wait a few minutes to see if your baby falls back to sleep.
Helping your baby get the right amount of daytime sleep isn't always easy. Don't feel bad if some days are more challenging than others. Remember to look and listen for the signs that your baby is tired and try to keep his or her nap routine consistent.
If you have questions or concerns about your baby's napping schedule, talk to his or her doctor.