Is weaning the right decision?

Basically my son is 5 months in 10 days time. At nursery the other day they gave him some pureed fruit and honestly I didn't mind because I want to start his weaning soon anyway. But after Reading on the Internet that you should wait until 6 months I'm not sure. I've given him a little fruit since then and have also given him some rusk and milk and some chicken and veg cerole from a jar. It hasn't upset him at all and he seems to enjoy it. Personally I'm thinking health professionals change their minds all the time and they used to give food at 4 months and that didn't hurt anybody. I've been giving him little spoons in the middle of and after feeds. At the minute he takes 7 ounces but ever since birth has not gone any longer than 3 hours and screams for his bottle. He's a good sleeper but always stirs and wakes a couple of times in the night. Sometimes for food. What do you think? Plus he licks his lips to taste it and likes it but it sometimes comes out his mouth all over his bib, does that mean he's spitting it out?