How am I suppose to?

It’s like my husband expects me to be a million different places at once. He wants me to trim the dogs hair. So while our two month old is still sleeping, I tell him to occupy our 18 month old and I’m going to trim the dogs hair. Only his face so I wasn’t in there long. I come out and he says “your spoiled brat is crying”, talking about the 2 month old. I look around, the 18 month old is gone. I run in there and sure enough she’s in there with him and has woke him up. My husband laughs about it! I said he wouldn’t been asleep for another hour or two if you would have just watched her for a few minutes like I asked. He thought she was in there with me, but sure didn’t check. I thought he was watching her since I asked him to and he was. Then tells me it’s all my fault cause the door wasn’t locked. He says “you ain’t gonna stop til something bad happens to one of these kids. And you’re gonna stop talking to me the way you are.”

How was I in the wrong when he knew the baby was asleep, he was suppose to be watching the 18 month old, and I was trimming the dogs hair like HE asked me to do?!

I feel like I’m fighting a losing battle.