Sex is .... meh.

Let me just begin by saying I love my husband more than anything in the world. We’ve been together for 11 years. Have three kids 4, almost 3 and a 14 month old. Yes, it’s chaos. Usually are sex is good. But only have it maybe 2-3 times a month. A lot of the time he can’t seem to cum/finish because he hears the kids in the morning running around. Which okay. Fine. Recently we decided to have one more babe. But dang the past couple times he hasn’t been able to stay hard... I can’t help but feel super disappointed. I know he feels my disappointment and he says that he feels “pressured”. I’m sure he does and I don’t mean to make him feel that way. But he hasn’t finished in a month...got any tips? Should he watch porn before he has sex? Idk. Advice? Thanks for listening