I'm in a similar situation, DS3 born on 98th centile, nearly 3lbs heavier than either of his brothers
. He is 4 months and EBF. Feeds less often than your DS, but does wake severally each night to feed. I sympathise, it is v tough to have so little time between feeds (presuming it's the same at night as during the day?)
Having said that, DS1 was a shocking sleeper (despite being a relative tiddler) and I weaned him at 20 weeks (baby rice) in a despairing attempt to get him to sleep more. Sadly, it made not a scrap of difference
and I then felt crap for having weaned him earlier than recommended. DS2 was fine on just boob until over 6 months, thankfully.
Am worried that I will struggle to get DS3 to 6 months before weaning, because he is so big. But then I tell myself that he is getting that big on just breastmilk...
Don't know what the answer is. Will he take a bottle? If so, maybe try some hungry baby milk as a last feed before bed, as an alternative to solids? I am trying to get DS3 to take a top-up bottle at 7pm, so far no joy.
Sorry, probably no help. I am v wary of going against the official advice (albeit that it is only a guideline, yada yada) - but that has to be balanced against your own mental/physical health - it is v tough getting horribly interrupted sleep, and physically demanding feeding a bouncing baby so often.