for proper physical development all you need is to feed children plenty of meat and little of anything else ( after they finished breast feeding that is )
all these parents sending their kids to various soccer and swimming teams etc. is just status and virtue signaling
and for proper intellectual development all you have to do is not send your kids to prison ( school ) and otherwise get off their dick
and give them a few pointers in life like the fact that all women are gold diggers and that in general everybody is their enemy - suggest some good books to them ( like Mein Kampf ) and explain that they have less time than they think they have to accomplish what they want
that's it. no need to hire math tutors or pay for swimming lessons. leave that shit for chink parents.