Ask him why he feels like he’s on eggshells. My baby’s dad and I struggled and we weren’t talking much at all and we had a long hard talk. He brought up what was wrong and I became aware of things I was doing and not realizing. He’s a person who just had a baby to.
What helped me a lot was asking more for help from my partner with the baby and some housework. Do some simple self care. See your family and friends. :)
I think deeper conversations need to be had to understand why feels like then both of you find solutions together.