Baby more attached to dad

My baby is almost four months old and I am the main care giver. I do everything for him and also play with him the whole day. My husband works during the day and takes care of him for about 1 to 2 hours in the whole day. However my child reacts more to his dad. Smiles more, laughs more and talks more(baby talk) with my husband. I have to struggle to get my baby’s attention. I am genuinely happy for their wonderful bond but sad that I dont have it. I always thought that babies will be more attached to main care giver but in our case it isn’t. I love my baby a lot. I am so hurt that he doesn’t reciprocate it. Where might I be going wrong? How can I improve my relationship with my baby? Pls help this sad mom 😞