Lie in bed a lot and occasionally emerge for tea/snacks/magazines/showers.
or
Set up a mission control in your sitting room with everything you need for feeding and associated relaxation around a comfy chair, so a nappy changing kit, feeding things, muslin, spare bra and pads etc., magazines, remote control, drinks, flask, biscuits, etc. Plonk yourself in there and make the most of it. Binge on box sets. Feed as much as you like.
Occasionally emerge into the daylight and push said child around in a pram wondering at the novelty of it all.
Compulsory to cry and/or have some kind of tantrum thing occasionally and then take yourself off to the hairdressers in a huff. Leaving offspring behind with their father. Many men are strangely good about understanding this, as it's officially hormones n that.
If you can get some washing in and out of the machine the same day give yourself a pat on the back.
Now and then get a babysitter, get dressed up a bit and go out for a drink or something. Helps you remain vaguely human.