Worried about my husband bonding with new baby

So kinda long story, but I'll try to keep it short. I have two step children that are 3 and 4 that my husband and I have full custody over. I love them to death and consider them my own. Lately I have been worried that he isn't gonna have the same bond with our child that he has with them. It has been a pretty hard pregnancy and I have had to get over a lot of things. For example, it's been really hard to get over that I'm not the first person to have his baby and that I'm not his first wife. It's really hard some days knowing he has gone through this special time with someone else twice. It makes me worry that this time isn't that special. I really do love my husband. It feels like sometimes though the kids are his favorites and he doesn't really talk about the baby we having very often. Any advice on how to deal? Anyone else ever feel the same way?