Do we have the custom of washing feet during baptism?

St. Ambrose spoke of a custom that was performed only in Milan, where the bishop or priest (who is baptizing) would gird himself and wash the feet of the person being baptized.¹³⁷¹ It is a strange custom since the baptized person emerges from the baptismal font already clean and does not need his feet to be washed at this time. It is possible that the priests wanted to announce to the baptized the fact that the Church will continue washing his feet during his life, even after his baptism.