Aww this is so sweet! Being the favorite uncle is quite the honorific. I have a 2 year old of my own and with daily parenting I try to be conscious whenever we have family and friends over that a baby is a bit foreign to them and they don’t know always know how to interact with him/ react to him.

Best advice is let the little one lead the way with things and encourage them always with what they are doing (as long as it isn’t dangerous!).