That’s completely normal:) baby’s discovering that she has hands, and this is part of their learning. Soon she’ll grab everything and put them in her mouth. You don’t have to stop her at this stage. They need this to learn how to eat in the future too. And sucking on the hand is comforting to baby, and baby learns to self soothe. You can wean off the sucking next time :)
Zera. OO