I have no objections to any woman who wants to be a mother. Forced non–motherhood is as bad as forced motherhood. If you want to be a mother of five, feminists are perfectly fine with that.
What feminists don’t like is the Cult of Motherhood; the idea that being a mother is the only thing that women should be and that their lives should consist of nothing else. By elevating motherhood into an end–all be–all, anti–feminists negate the entire idea that a woman can choose for herself, and instead compel others to do something; they change the decision maker from the woman to someone else. As illustrated by the Cult of Motherhood, a choice with one option is not a real choice.