What happens if in early stages of pregnancy..the mother was shooting up morphine and subutex?

im not pregnant, but curious?
what if she stoped as soon as she found out she was pregnant?
would baby need to go on subutex after birth?

: http://alcoholdrugstreatment.info/what-happens-if-in-early-stages-of-pregnancythe-mother-was-shooting-up-morphine-and-subutex