How long does it take methamphetamines to get out of an unborn baby?

Depends: On the gestational age of the baby and how frequently the mother uses.. Usually it is the same for the baby as the mother. Could take a few days to a few weeks.

Depends on situation: To some extent this depends on level of use but it also depends on where they look. The urine of a baby exposed to meth will generally show positive to use within the previous week. Near term or longer if premi. If suspicion is raised i send meconium, the kids first bowel movement & it can show use within the last several months.