We weaned my son at just over 4 months after speaking with the health visitor as milk wasn’t enough for him, he was draining all bottles I think he was 9oz every 3 hours from memory and once we started him on food he loved it, my daughter on the other hand showed no interest in weaning until 6 months and wasn’t in full swing until 7/8 months, every baby is different and you know best, speak to your health visitor and see what they recommend, if he is showing an interest in food and shows all signs he’s ready then you could start with purreed veggies, I bought the purple Ella’s kitchen book and it was brilliant as it comes with a tick list of what to try and when, has a little chart you can pop on a cupboard or your fridge, good luck xx
I’d be interested to hear more on this