Plus Size Preggo

Baby boy just had his 4 month doctor appointment. He’s 26 3/4 in, which is in the 97%, but he weighs 13 lb, 5 oz, which is in the 10-25%, so I was told to start on solids ASAP, along with continuing to breastfeed.

I know I’m going to try oatmeal over rice, because rice tends to be constipating and little guy already goes just once a week, but any suggestions for fruits and veggies to start with? Is there a resource/list of safe foods for a 4 month old? I plan to steam and purée the produce myself, nothing jarred.

Thanks in advance!