Doesn't Asagi say this of Yotsuba in one episode, and Tiger says she is cute but doesn't look like a monkey. Which of course has no relation to this whatsoever, most likely.
I think Nobita said that when he and Doraemon went back in time to his birth
Do you think so?Thank goodness...and get inside to Sakuya's room on the double, hm?Ah, my Lady!Now, why don't you leave the rest to this fellow,She looks like a little monkey...The birth passed without incident, and both mother and child are doing fine.Can I come in...?Thank you for taking care of the gate....sister.Shourei?Ah, "big brother" is here!By the way, that guy's seriously strong...Now, come on over and say hello to your new...