I would stay clear of corn.
Allergies can happen with any foods and at 5mo dd had a massive reaction to corn.
We stopped solids immediately after that and waited until she showed signs (BLW) she didn't really start until 7-8 months.
Food before 1 is just for fun.
Breast milk/ formula should be their soul food before then, it has many things food doesn't and can help when bubs is sick, and messing with an immature stomach and digestive system is in now ways fun.
Dd also has a long list of allergies (epi pen required for most of these) and I just can't help but wonder sometimes of starting solids early effected that in any way.
Watching a 5mo baby having an allergic reaction that could have had devastating effects is not something I would wish upon any mother.