I think Cosmo did a good job of covering this phenomenon, with this article: Why do postpartum women get such drastic new hairstyles?
Also post-partum is a cool word. As someone who will never be able to give birth herself due to health reasons, I will never get to experience it. But actually, as i suspected, it's for a deeper reason than what's on the surface. It's all about a new phase in life.
Yeah, there are the practical reasons. Babies love to grab and tug at whatever can be reached. That's part of how they learn. Then there's the shortening of the morning routine. As someone who has a wash and wear sort of hairstyle myself, I can get why a new mom would want to transition to something easier.
But wait! This post-partum (love that word too much, Geez!) Hair obsession goes the other way, too. As Ms. Breslaw said in her Cosmo article, color changes and even more elaborate hairstyling can come out of this new phase in life. It's about a woman taking control of her body again, it's said. Yeah psychologically I get that. You're free to be one person again. Well, at least physically, that is. You're sharing your life now with a new little person who shares exactly half of your genetic material.
(I don't even want to get into moms’ obsessions with their kids’ hair. That's a whole rant right there.)
So the question still begs to be answered. Should a new mom cut her hair? Why not!? It's her hair. But if you're looking for advice on if you should go the mom hair way, I'd say don't do it just because you can. I mean, it's only hair, right? But I should know how much a girl's hair means to her. Don't feel pressured to give into the temptation. That's the only real advice I can offer, about any major life decision, really.
Would I if I had the chance? Hell no, I'd grow it out and go be a rock star!
Really, read that article. It should help you make your decision… along with the twenty bazillion other articles about it...