A baby navel protecting pocket belongs to baby costume article for avoiding navel cold and causing various diseases, which comprises a neck belt 1, an oxter belt 2, a loosening belt 3 and a side border 4, a pocket bottom border opening 5 where the loosening belt passes through, a bottom border 6, a pocket 7 and a collar opening 8. The navel protecting pocket is characterized in that the belt 1 is sewed vertically with the oxter belt 2, the loosening belt 3 is vertical with the side border 4 and parallel with the oxter belt 2. The loosening belt 3 is inlayed in the bottom border 6 of the pocket 7 is sewed with the pocket bottom border opening 5. The collar opening 8 is in the same place with the oxter belt 2. The utility model does not expose the navel when the baby is in sports, and is easy to change when dressing to prevent cold and protect health of baby.