Baby swing help

Jeannie
Hey mom's I need help. I have a Graco portable baby swing for my LO his only a month and a half and as you can see in is picture his not a small fry. But his probably about 12 lbs and the swing is rated up 25 lbs but the swing will not swing him cause his to heavy for it. So my question is do any of you mom's know of any good swings for larger babies?