Good grief.
OP, my baby is a little bit older than yours (24 weeks) and I've started giving him food this week. I listened to everybody and got really confused and guilty over all the contradictory advice- it seems that whatever you do, somebody will try and make you feel bad about it and be absolutely adamant that they are correct. And only them.
Yes, I even went as far as reading some of the articles which have been quoted from, which only left me more confused as, to be honest, the advice does change. And if people were adamant they were correct when they told my DH's granny to feed her son blancmange at 10 days old (seriously!), to telling my mum to start my brother on weetabix at 9 weeks, who's to say that telling us to wait until 26 weeks is correct now? Maybe we will be told in ten years time that we've done the wrong thing?
For the past six weeks, he has been feeding at least every two hours including throughout the night. Nope, the 'sleep regression' was not temporary and yes he is definitely feeding rather than snacking. Since I started him on food, however, he has slept better and been generally happier during the day.
If I was to give any advice at all, from a mum in a fairly similar situation, it's stuff everybody else and do exactly what you want. You'll know soon enough if there are any problems.
Good luck!