jjsc3, you might be surprised like I was to realize something. No two children in the same family have the same parents.
Think about it.
Life happens while we’re having babies. I was a very different mother with my first, versus my second, versus my third.
The children later on had a mother who was more distracted by more obligations.
You can’t blame a child’s behavior on the hormones during pregnancy. It’s not something you can really even study. If your wife is stressed out more, that will affect her parenting.
And the gender of the baby could affect things… boys are sometimes given to more behavioral problems as children.
And how a baby behaves as an infant doesn’t always predict things. My quietest most well-behaved baby has been the biggest challenge as a teenager.
Don’t be afraid to step in and give your wife as much help as possible. Three young children is a lot. She sounds stressed. And if there are any marital problems at all, that has a HUGE effect on even young toddlers. They react to it even when the parents think they are keeping things private. Kids are like stress meters. They KNOW. And they act out.
I’m not saying you are responsible for anything. I’m just saying it’s a hot button with me personally. My xh used to accuse me of being “hormonal” because that then meant he didn’t have to face the fact he was driving his family into the ground with his selfishness.
So if you are doing as much as you can and being as loving as you can be, and your wife is still depressed, then worry about your wife’s hormones. Be sure she isn’t reacting to YOU when you bring up hormones. I promise you that discussion won’t go well for you.
Better yet, offer to let her go off by herself with some female friends for a weekend. YOU take care of the kids all by yourself. (No bringing your mother in to help.) When she gets back all refreshed, maybe you’ll have a really good understanding of things. I find a startling number of men have NEVER taken care of their own children and house all by themselves for more than 9 hours at a time. Yet wives are expected to do that, clean the house, cook and remain chipper, happy and ready for hot lovemaking at 2 in the morning and when they aren’t husbands call them names like “hormonal” and such.
Not accusing you… just in case there are readers out there who may not have seen life from that point of view…

Some women really aren’t hormonal. They’re overwhelmed. Life wasn’t supposed to be like this. You weren’t supposed to be so tired you wanted to fall asleep under the tomato stand at the grocery store. Kids reflect their parents’ emotions more than their parents’ hormones.