Husband is distant

My husband and I have been married almost 3 years. We have 2 baby boys together. We just had our second a month ago. I’ve been suffering with PPD. Im a stay at home mom and he works. Lately he’s been working a lot more to get us caught up on all of our bills. Since our second son has been born I’ve felt like we’ve been closer other than this past week. I asked him why he’d been acting off, and he told me he wasn’t sure why but he just felt like since our son was born we haven’t been as close. I was totally blindsided because I felt the exact opposite. He says he still loves me and wants to be with me, but just feels distant and doesn’t know why. He wants to fix it, but it’s hard to fix something when you don’t really know what it is. Has anyone else gone through this and how do you fix it??