yes, that is probably the stronger average turn combo.
Just dont forget, if that is all you do... you could lose 9 points per harvest.
having the 1st turn mayor is equally or maybe more powerful, because you can guarantee, that you get maximum actions (+10 points for 4 children) and almost no negative points ever (maybe 1x in the first round.)
But don't forget, you also need reeds and other resources for those houses.
Also, it looks like you're interpreting that is getting 3 points for your 3rd baby and 4 points for your 4th. I don't think he meant that when he said:
"+1/2/3/4 if a player has 1/2/3/4 babies."
Now if you had the midwife...