Is it normal for baby vampire to lose powers after age-up?

My human Sim had a baby with a vampire. The baby came home in a vampiric bassinet, caused discomfort when breastfeeding ("are those fangs?"). As an infant, its needs panel had a vampire icon. As an infant and toddler, it had a "bite" social (with a vampire icon).

However, after aging from toddler to child, her needs icon is the same as a normal human's.

I'm wondering if this is a bug (I have the Parenting expansion pack) or if the child is still a vampire and it's just not visible at this stage of life