3mo has trouble bonding with dad.

My baby girl is almost four months old now, and the sweetest little thing! I'm a SAHM, and my husband works from home. Just lately he's been unable to soothe our baby when she'd upset, or put her to sleep. It's strange, because he spends so much time with her. Does anyone have this problem? It's tough on him, I think he's beginning to feel a bit unloved. 😯 The second I pick her up she calms down. Any advice?