Hang in there. It will get better.
Go easy on yourself.
There is nothing you can do to keep from being tired and worried and worried that you are tired and worried that you are not worried enough.
You are going to want the perfect Halloween pictures and the perfect Thanksgiving pictures and the perfect Christmas picture. And you may get them. Or you may not. Or you may threaten and bribe and scream through gritted teeth until you get just one, just one where everyone is looking at the camera. And then you will look at those pictures after you download them to your computer and you will know, in your heart that those smiles are fake. But know that all of your friends Happy Christmas card pictures are probably fake too. And that's ok. Truly.
Because in a few years you will forget about most of it. Mostly. You will forget how hot it was, how the babies diaper exploded in your arms, how you and your husband fought over how many pumpkins was a "reasonable" amount to have for a family your size. You will forget how fake those smiles were.
Because really, they weren't. They were in the moment of course, but they weren't in the greater scheme of things. Because you really love those babies and your husband. And you have now slept most nights all the way through for several years and that always help things look nicer, brighter, cheerier.* And those days were what they were, and you did it. You survived the Birth-6 years old marathon. And you smiled in those pictures because you are a good mother who is making good memories for those babies. Those same babies who grow up and say "Look momma! There we are at the pumpkin patch when I was two. Wasn't it fun?"
And you will say, "Yes. yes it was my love. So much fun."
*Also, they will eventually want to wear mariachi band gangsta mustaches in their pictures and will no longer care. As long as you get a Margarita out of the deal, you are just happy they are still willing to pose. Because as you now know all too well, things do not remain the same for long.