Wait till 6 months Its more to do with their little insides being able to cope better

Are you breastfeeding (I know you said bottle, but is that EBM or formula)? If so a baby can go a very long time just n tha DD#1 had no interest in solids at 6 months and didn't really care much till about 10 months. I know a lady who's little ones dont start till 12 months (properly anyway)