XY is growing up

So my baby XY is a very sensitive girl. She has stranger anxiety and not easy to get close with. My nanny has been complaining that none of a child she looks or looked after in the past reject her whenever they go to her place. XY is a exception that she will be excited when she sees me and wants none else. The nanny has been helping me since hubby went off last Saturday. So XY has got worse that she sat down on my lap while I was having meals. Back at home, she will ask me to carry her most of the times. I get to relax when she gets distracted by her brothers so she runs off to play with them. This girl of mine is 21 months old that I’m thinking to potty-train her. It’s always easier for boys at this age, based on my experiences with her brothers. But with her, I tried once and she followed exactly what the brother did. Since our anatomy is built differently, it probably won’t be this easy.