I dont know what to do about my husbands behavior towards me ;(?

He avoids me, ignores me, we can be in the same room or sleeping in the same bed like the other doesnt exist. It totally sux! We got married 2 1/2 years ago. Were always in love. We had a baby and I gained some weight. His sister was recently at our place and she 120 pounds, he (proly jokingly) said he wants me to be 120 (shes 5'3 im 5'7) so after stupid comments like that I finally blew up and told him that his comments hurt me and that he should stop comparing me to his sisters (they r single no kids) and that maybe he should have married one of them! The next day I said I was sorry but that didnt help. Its been like that for 4 days now. And im not huge or anything just weigh a bit more than I used to. Help ? how do I get him back ?