TK at 3y+

Child: Can Mei Mei walk 妹妹会走吗？
Mother: Mei Mei still a baby, can't walk yet, so need to be carried 妹妹一出世还不会走，需要抱。

Child: I can carry Mei Mei, no problem 我抱妹妹，没事。
Mother: But Mei Mei is still very fragile, the bones are still soft, so must be very gentle 但妹妹骨头还很软，要轻轻抱。

Child: Why the bones are still soft 为什么骨头还很软？
Mother: Because only when Mei Mei is older, the bones will be stronger 因为要长大一些，骨头才会结合便强壮。
Child: 哦 I see..

(A few days later..)
Child: Can Mei Mei walk 妹妹会走吗？..