Hi. I'm a mum of one child who is now 13 (I had PND so could not face having any more). I still remember very vividly those first few to 12 months.
My answer would be: prioritise yourself and your baby, and it's amazing what you realise is secondary. It's wonderful that it's no trouble for some mums to do everything (even run a business) on top of caring for an infant etc. But you never really know someone's circumstances. And frankly, anyone who is doing it all and more may well be on the bipolar spectrum - or that's what my psych would say. (It's amazing how much you can get done when you are in the midst of a good bit of hypermania! And people with bipolar - an illness I have - are often undiagnosed as they never go to the doctor for the hypermania, just the depression.)
In Oz, around 1 in 5 mothers suffer from PND (postnatal depression) or a mental illness brought on by having a child. It's often called the "smiling depression" because the mums become expert at hiding it from friends etc. My experience with PND was that if I was to survive (and avoid hospital) I had to do good things for me when my baby was sleeping. It's a message that I think all mums would be wise to take in.
Catching up on missed sleep (a biggie early on), sitting outside on the verandah having a cuppa, watching a favourite tv show or reading a good book - are just some great ideas. Yes - there are a few bare minimum things that really must get done by someone - like cooking the dinner or cleaning the loo, but a lot of other things aren't that urgent. My partner would take care of putting the wash on, but if I couldn't get it out on the line on a particular day he could put it on clothes horses inside to dry. Dinner can be really simplified when needed - healthy toasted sandwiches or an omelette or good old tacos are great. And baked beans on toast supplemented with the bare bones of a salad can be the best idea on days when you are really struggling. And maybe dinner preparation has to wait until hubby is home so that one of you can cook,while the other looks after bub. For a while, my hubby & I would have to take turns just to EAT our dinner!
The other crucial thing - whether you're PND-free or not - is to give yourself lots of pats on the back for everything you manage in a day. Just looking after an infant or young child is a remarkable achievement! If you start going back to work you will likely realise that most jobs are much less stressful and demanding! The worst thing that mums can do is to compare themselves with others, or compare others with themselves. We're all different, with different needs and different strengths, and our babies are the same.
I was in a PND support group and it was fascinating to hear how many of us found "new parents/mums groups" less than helpful - because of all that comparison that goes on, or the exchanged glances etc etc.
If you and your baby/children and partner are getting their basic needs met PLUS a good dose of love (most especially for the little ones) then tell yourself you're "bloody marvellous"! Because you are ;)