i need help

so I'm 20 weeks and 5 days and my boyfriend feels like I have no say so at what is best for my child as far as feeding and where my child goes because his family knows best I told him I really didn't want my child to go with his family because they feel like I'm too skinny and my baby is not going to be healthy mind you his family they're all big you know nice size and I always have been skinny and I told him what they said about me and my baby because my other daughter it's small just like me but she's healthy she came out a 7 pound baby but he said well maybe they right you need to gain some weight and I feel like my child to be over there so my child can be healthy just like me he didn't support me in anything he has family said about me and I'm tired of arguing because he feels like he's always right I mean he never had a problem with my size before until his family decided to say something because I was pregnant