So far, you are doing a great job of keeping dad involved in this new baby’s life. I think it would help to change your mindset from “It is going to break his heart if she rejects him” to “yes, baby will probably take some time to warm up to daddy, and we’ll deal with it when that happens”. Dad should expect some of the cold shoulder; he is a bit of a stranger to her. Baby will sense your apprehension, so it is important to not stress over this. Do the things you’re doing now, and when dad gets home, be your natural “happy to be re-united” self. Baby will soon learn that you love this man, and she will soon follow. Spend more intimate family time together - let your baby see dad and mom being close and affectionate. Family walks - go for frequent family outings. Have dad carry baby around most of the time. Baby may be too distracted by the surroundings to realize he is in the "wrong" parent’s arms. Above all, realize that this phase will pass.