I have 3 DC's.
Baths are only once a week at the most - life is too short, plus DD2 sounds as if she is to be murdered if you try to wash her hair.
Baby monitors - a godsend if you want to go for a night out to you next door neighbours (semi-detached) and still hear the darlings as you crack open the third bottle of wine. Same applies for the end of the garden.
Stair gates/ Cupboard locks etc - survival of the fittest and natural selection prevails in our house. If you poison yourself/fall down the stairs etc, well too bad, next baby please.
Mother and baby groups - one phrase - parent council members in the making - not recommended.
Clothes - if it looks okay, it must be okay, even if its 3 days old. Also, it is acceptable for both daughters to wear full pirates of the carribean regalia with wellies to car showrooms when choosing a new car even if the staff look a little alarmed.
Sleeping on the back - DD1 got a terrible flat head and I swore never to do it again, corrected it be sleeping her on her side as I saw every parent in Helsinki doing on a visit there and alternated it every night until it was normal again at 6 months. All subsequent children sleep on their sides or backs. They sleep better that way anyway.
Sterlising - I still like to do this with DS1 - 4months, but I don't know why? Even if the dog licks his face and he likes to lick the dogs bowl??? Social conditioning, I can't help it, but a waste of time probably.