It was super cute, getting the babies into their pen was much more fun than I expected. However, I did encounter a bit of a blocker. One baby got stuck! I am including a picture below. I could not get the baby to budge from that spot no matter what I did with the rattle so I was stuck at 19 kids recaptured. :( 
I got all 20 of them in on the second play through. It was not what I was expecting and I think you did an amazing job presenting your point.