Churching of women was a custom that used to happen a long time ago, and it was part of the Christian religion. When a woman had a baby, she had to wait for a few weeks before she could go back to church. This was because in the old days, people thought that having a baby was a dirty and sinful thing.
After the waiting period was over, the woman would go to the church with her baby, and the priest would bless them both. The priest would say some special prayers and sprinkle holy water over the woman and the baby. This was supposed to make them clean and pure again.
The tradition is no longer followed in most Christian churches, but it was a way for women to feel welcomed and acknowledged after giving birth. Nowadays, there are other ways to celebrate the birth of a child with family and friends.