A woman is not responsible for the gender of her child. In humans, sex determination is of XX-XY type, i.e  XX is female and XY is male. A woman can produce eggs of only one type (containing X sex chromosome) whereas a male can produce both the types of sperms (containing either X or Y sex chromosome). The gender of the baby depends on which type of sperm fuses with the egg. If Y-containing sperm fuses with egg then the resulting baby will have XY combination and will be male. Similarly, if  X containing sperm fuses with the egg, the resulting baby will have XX combination and will be female. Thus, the man is responsible for the gender of the child.