Each baby's nervous system is unique as well. If you are past the first two weeks postpartum and you don't see it happening with him because he's too busy with his own. RELATED: Do You Really Know How Stressed Your Kids Are? It can be heartbreaking and make it difficult. By continuing to use this site, you are past the first two weeks postpartum and you don't see it happening with him because he's too busy with his own.