They start learning from the moment they are born (& some say even before then) so that’s why you need good nursery room ideas for boys, to provide a rich environment.
I remember reading an article many years ago and it said that a large percentage of a child’s ultimate IQ is devoloped by the age of five.
The more stimulation you can provide, starting in the nursery, the more you can help your child develop their potential. But remember to make it fun so that it’s an enjoyable experience for them and you.