You can use the sign for daughter whenever you meet another baby or are on an outing. Toddlers seem to be fascinated with other children. When your toddler or baby starts looking at a female child, point and say, “That's their daughter,“ while doing the sign.
Use the daughter flash card along with the son, baby, mommy, and daddy flash cards. The objective is for your baby to develop self-awareness and understand familial connections. As your child gains further understanding of their surroundings, you can introduce signs for other members of their society, such as aunts & uncles.