Foods for gaining weight

St

So my march baby will be 10 months on the 30 and yesterday at his check up he had only gained 7 oz from his last visit 3 months ago. He eats great, solids and breastmilk (he only nurses, refuses bottles)

We're going back next week for a weight check but I was wondering if you ladies know any foods that are good for weight gain? He doesn't have any teeth yet but eats pretty good. Thanks!