P.M.
Edited response:
I've found that expectations tend to backfire – almost every time. If we expect things from another person that are not within that person's range of interests and abilities, the results leave us disappointed, possibly discouraged or angry.
That's not to say the other person can't increase his/her range, but think about the last time you found it necessary to change to meet another person's expectations. What, if anything, made you interested in doing so? And once you saw the need or benefit, was the change easy?
Or have you ever even been challenged to change? Most of us haven't, and would feel amazed or outraged that someone simply laid that on us. But we do it to each other all the time, of course. A common cause of friction, especially in marriages.
I, too, would be concerned if my husband didn't want to interact with my 6-month-old baby. But it's a common situation for daddies. Even my son-in-law, who is an utterly terrific dad to his now 4yo son, was puzzled and helpless when the baby was only a few months. It helped a lot when my daughter played with the two of them together, coached Daddy on what Little Guy liked, what he responded best to, and how to do specific things with him.