Girls do not produce milk until they become adults and experience lactation, which is the process of producing breast milk.
This usually happens after childbirth when the body produces hormones that trigger milk production. The age at which girls become adults and are able to experience lactation varies depending on individual factors and cultural norms.
However, it is important to note that some girls may experience precocious puberty, which is early sexual development. In these cases, they may develop breasts and experience breast milk production at a younger age.
In summary, girls typically do not produce milk until they become adults and experience lactation after childbirth. However, some girls may experience precocious puberty and produce milk at a younger age.