I would also wait 9 months to a year.
It's all about baby brain, which is a real thing. That nobody told me about. Because they forgot. I am not joking, but it is funny.
Hormones and lack of sleep. I tell you, right after you have a baby is the LAST time you want to take on something new. Both babies, I was able to hold my own doing the job that I had been doing (though realistically, I was doing about 25-30% less, because I was tired).
I told a friend this once. She's my age, no kids, and chastised me for even suggesting such a limitation. I just said "man, you just don't know until you are there. With a new baby is NO TIME to be trying something new."
YMMV of course.