He doesn’t look at me the same

My husband and I have been together for 6 years. We have one little boy who is 20 months, and a little girl on the way. My husband is a pretty darn good husband and father. Of course he has his bad days like the rest of us, but for the most part he is always on his A game. But I’ve noticed over the past few years, the way he looks at me is different. He used to look at me with these squinty love eyes, everyone noticed the way he looked at me and adored me. He used to be so lovey and was always holding me, kissing me, making it known just how much he was in-love with me. But now a days, that fire behind his eyes is gone when he looks at me, but I see it when he looks at our son, that’s the only way I’d know that it wasn’t from his face changing. It’s really painful and I find myself looking for reassurance that he does love me. We have a great sex life, very open and communicative. Something has just,, changed. Maybe it’s the weight of the world on his shoulders, or maybe it’s as simple as the way my body has changed from growing little humans. Anyway I’m not really looking for advice, I know there’s nothing you can really do about this except let it all play out. It just SUCKS