No you don’t. Most mothers are happy to feed anywhere, especially when they know they will be welcomed. Some mothers might ask you if you have a private space, maybe if their baby is still very young and they feel uncertain about feeding or if they have a baby that is easily distracted so if you have a private space where a mother can sit feel free to offer it to a mother who asks. It is never appropriate to suggest a mother feed her baby in the toilet or to insist a mother uses a private space if you have one.