drag him on a female villager (one who is over 50 if you do not want more population) and once it says, "this villager has improved at parenting" pick him up and do it again. If you stick with him it should take about 5 minutes. Oh yeah, if you are at the max population a message will pop up saying there is not enough housing. I usually ignore it and continue until they become master, but the choice is yours.
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