Girls, the baby is 3 months old. Since 2 months, he can't fall asleep …

Girls, the baby is 3 months old. Since 2 months, he can't fall asleep on his own during the day, only at night. He sleeps from 20 to 40 minutes. Then you need either breast or rocking, but it doesn't always work. He may suckle from the breast and wake up completely, or during rocking he may not fall asleep. How do you extend naps?