I have read many comments now from mums who feel they were simply too exhausted to work and I just have to wonder - what about all the fathers / partners? Are they not having their sleep interrupted and still need to go to work every day? Don't you share night shifts and household duties at all? I understand some things fall on the person-who-gave-birth - if you are breastfeeding and baby is cluster feeding or refusing the bottle - but under most circumstances surely your partner is helping out? (Do not mean to exclude single mums - you are ace!)
Please google fourth trimester.
Your baby has been living in your body for 9 months. You and your baby have a bond that's totally different to the bond that fathers have with the baby, at least at first. Your body is attuned to your baby's body.
Before I gave birth, I was a really heavy sleeper, I could sleep through anything. DP also. That changed when I had a young baby, for me at least. Not DP. This is a change beyond my control. If my baby so much as snuffled in his sleep, I was awake! I was alert to his movements, while I was asleep, in a way DP just wasn't . Still, to this day, when 10 yr old DS wakes up and gets out of bed (some days ridiculously early, I wake up, unaware why I'm awake, then hear DS sneaking out of his room to play computer before breakfast!)
When he was little, and woke in the night, I woke before DP did. Getting DP to get up and look after DS, involved waking DP up out of a deep sleep and telling him it was his turn. By the time I got him awake, I was fully awake myself, so totally different from DP just sleeping through my wake ups. Often it was easier to settle my baby back to sleep than go through his rigmarole.
Also, if you are BFing, (and I hope you do manage to, it's much better in the long run for all sorts of reasons. Not least because it's free and once you've cracked it, so, so much easier and less limiting than bottles) then if you want your DP to get up in the night, you'll need to express loads of milk and hope your baby takes to a bottle.
Then, because you're at home with the baby all day, and because of the bond you share, most mothers become experts in interpreting and responding to their baby's cues long before fathers do. Often you can't just hand your baby over to your other half to settle, as actually your baby just wants you.
Society sells us a nonsense idea that men can be as involved in a small baby's immediate needs. It's simply not true. Babies are born in women's bodies, and in those early days, there is a difference between men's and women's roles. I didn't appreciate this at all before becoming a mother. Yes, absolutely, men should share 50% of the labour. But what they do isn't the same as what women do, because of our biology. (Worth remembering, housework and nappy changing don't require any special biology! Nor do cuddling the baby while you have a lie in).
Women should be supported to care for our babies on those early days, in ways that work with our bodies, not expect us to be all things to all people in my opinion. Motherhood is a role only women can do, and it is different to fatherhood in those early days. I think we do ourselves a disservice not to recognise that.