It’s really common for babies to want to suck almost constantly on the second night. Unsettled behaviour on the second day is not due to hunger. Instead, your baby is waking to the sensory changes between his cosy womb world and the ‘outside’ . The closest place to ‘home’ now is snuggled against your comforting heartbeat, sucking at your breast.
This sucking is important to help your baby practice feeding (coordinating sucking swallowing and breathing) before he has a large volume of milk to contend with. Frequent feeds will help your milk ‘come in’ and the surges of prolactin (milk making hormone) that your baby’s sucking cause in these early days (after the first two weeks the surges are not as strong) are helping activate receptors in your breast that will increase your longer term milk making potential. By keeping your baby close and watching his hunger signals (rooting towards the breast and moving his hands to his mouth – crying is a late signal), your body will adapt and make exactly enough milk for your baby’s needs.
If constant feeding is overwhelming for you, as your baby dozes, gently release your baby from the breast by popping your little finger into the side of his mouth to break the suction and let him let him lie against your chest until he is in a deep sleep (his arms will become limp) , then move him to his bed or your partner’s arms if you need a rest.