DS2 is 20 weeks, he is so obviously not ready for solid food, even at around 18lbs (he hasn't been weighed for a couple of weeks).
He loves calpol, as he is teething he has had some quite a few times and he rolls it around in his mouth, he has lost his tongue reflex.
This is a sign of readiness, however, he has none of the other signs. He cannot yet sit unaided, he cannot grasp food, if he does get hold of something, yes, it goes to his mouth, but to suck, because that is what babies his age do. But he cannot chew.
He also still wakes in the night, because babies his age do.
If peopel were taught the signs of readiness, which although can include waking in the night, also include, being able to sit unaided, being physically able to pick up food, put it in their mouth and chew and swallow it, then we wouldn't have anywhere near as many problems with early weaning.
We shoudl abolish all purees completely, and advocate BLW, so babies can decide for themselves, then if you wanted to sit your baby in a highchair at 17 weeks with some steamed carrot, it wouldn't be an issue, because they wouldn't eat it if they weren't ready.
FWIW, I hae great HVs, they are all for EX BF/BLW/Looking at the baby rather than the weight etc.