M.K.
Hi L. -
IMO, bottle first, then solids. Formula or breastmilk is babies main source of nutrition for the first 12 months. If they never had solids until 12 mos. they would grow and thrive perfectly fine. I think solids are important, but at this point it is a distant 2nd to formula. They need to experience them and get used to them, but that is their main purpose!
This comes from a Mom who had/has a heck of a time getting my little guy to take a bottle, but he was eating the solids. He was termed "borderline failure to thrive" for lack of weight gain.
Good luck!