In redeeming sanctified items, the item is acquired when paying money and not by meshicha, pulling. What is the law if the price changes between the paying of the money and the pulling of the item or between the pulling and the paying of the money? The Mishna explains that the mitzvot that a father is required to do for his son are only incumbent on men and not on women (mothers). The Mishna also explains which types of mitzvot are obligatory for women and which are women exempt from, including time-bound positive commandments. The Gemara brings a braita that gives examples of the mitzvot that the father is required to do to his son - circumcision, redeeming the firstborn son, teaching him Torah, marrying him off, teaching him a trade and some say swimming as well. The Gemara begins to go over the examples and brings sources from the Torah for the father’s obligation and the mother’s exemption. Who is obligated in the event that the father doesn’t take care of it?