My husband always felt like our son didn't like him for the first 18 months. I think the best thing to do is, if you're home first, make a big deal about it when daddy walks in the door. "Daddy's home!" And model for your son the excitement you'd like to see. Ask the caregiver if they can talk about daddy throughout the day. Sounds silly, but it seemed to help us. I think my son just didn't understand--daddy was only around at night and on weekends, and he didn't know where daddy went the rest of the time. We also went to meet daddy for lunch at his work once, which seemed to help (I think my son was a little older at that point, maybe 2). I think things will soon change, because your son will be able to do more and play more and interact more with your husband in a father/son type way. My husband says he felt things REALLY changed when we went to Sesame Place for a day when my son was 18 months old. I guess going on the rides together, bonding that way maybe? So maybe there's something fun they can do some weekend--you can of course go, but just let their relationship bond naturally, and let dad do more of the care that weekend maybe? Things like a day out with thomas (google it). It can probably be anything, as easy as a trip to the pumpkin patch, to the park, but let dad take over a bit. Hope this helps.