Scripture seems to say nothing about a woman washing herself either after childbirth or after her monthly period.
Jesus’ Devout Jewish Parents and Their Child Prodigy
In the infancy narrative found in chapters one and two of Luke’s gospel, Luke has provided excellent character references for Mary, Joseph and Jesus. Jesus’ mother and father show piety far beyond the usual, and the young Jesus is eager to be in the temple studying Torah with the teachers of Israel.
What Kind of Blessing Is That?
In some cases a more informed understanding of the original setting of the Gospels can be communicated easily in a translation. A good translation will reflect that fuller, culturally appropriate understanding.