First three months is an adjusting period for baby as well. Baby needs to feel safe and secure. That is to say, baby needs to feel that they are in a familiar environment. Naturally being closed to you makes him feel secure and calm his nervous system. You can swaddle him so that he feels like he is still in the womb. Use white noise, swing, side lying and sucking to calm baby. You can read Dr. Harvey Karp's The Happiest Baby On the Block. https://www.happiestbaby.com/blogs/blog/the-5-s-s-for-soothing-babies
Read more