If baptism washes away original sin, why do women still get periods and pain? Catholic doctrine states that baptism washes away sin including original sin. Well, periods and pains related to child birth are the punishment for original sin, at least for women. Why are we still being punished for a sin that is washed away?
The Catechism is not exactly a clear to get an answer to this question.  Although the Bible says that pain during childbirth is a punishment (as well as man's toil, which I can attest to and woman being subjected to her husband, which I can't exactly attest to but I've heard things about in antiquity).

Although it is proper to each individual, original sin does not have the character of a personal fault in any of Adam's descendants. It is a deprivation of original holiness and justice, but human nature has not been totally corrupted: it is wounded in the natural powers proper to it, subject to ignorance, suffering and the dominion of death, and inclined to sin - an inclination to evil that is called concupiscence&quot;. Baptism, by imparting the life of Christ's grace, erases original sin and turns a man back towards God, but the consequences for nature, weakened and inclined to evil, persist in man and summon him to spiritual battle
CCC - 405


The fruit of Baptism, or baptismal grace, is a rich reality that includes forgiveness of original sin and all personal sins, birth into the new life by which man becomes an adoptive son of the Father, a member of Christ and a temple of the Holy Spirit. By this very fact the person baptized is incorporated into the Church, the Body of Christ, and made a sharer in the priesthood of Christ.
CCC 1279

The Bible does not say what the effect of Sanctifying Grace is and freedom from original sin is, other than being able to live forever in heaven, which is worth all the pain and toil in the world.
The fact is, that you still have, in addition to the aforementioned curses as a result of original sin, something called concupiscence

Etymologically, &quot;concupiscence&quot; can refer to any intense form of human desire. Christian theology has given it a particular meaning: the movement of the sensitive appetite contrary to the operation of the human reason. The apostle St. Paul identifies it with the rebellion of the &quot;flesh&quot; against the &quot;spirit.&quot; Concupiscence stems from the disobedience of the first sin. It unsettles man's moral faculties and, without being in itself an offense, inclines man to commit sins.
CCC - 2515

And concupiscence is what mainly separates someone who is free original sin (like Our Lady and Our Savior) and the rest of us.
The big question is, whether the Blessed Virgin Mary had pain during childbirth, and several mystics and theologians posit that she did not.