Sorry if I wasn't clear. Our pedi wants us to offer more solids with high (healthy) fat content and also suggested maybe adding pediasure or formula to his diet. We have a recheck in 3 weeks to see if he's gained any weight. If not, I suspect he will refer us to a specialist to see why he's not gaining despite being on a higher fat diet. I've decided to wait on pediasure and just feed him avocado or sweet potatoe with olive oil every morning. I've also increased his solid intake and let him eat as many solids as he likes. He's still nursing around the clock too.
I want to avoid supplementing if possible, but if he continues not to gain or starts to lose weight then I might change my mind. I don't have another cardi appt until after his first birthday but I might give them a call and see what they have to say about his weight.