Talk

I think rubbing tummy (has to be clockwise for some reason apparently) or gently bicycling their legs helps a bit

What happens if you just feed him when he's grizzling, op?

If he's genuinely crying because of hunger he will drink but he's in quite a good routine so when he's crying and not due a feed, he won't drink or he'll suck for a few seconds and give up. Sometimes a dummy soothes him, more often than not but there has been times he hasn't even wanted that. He is still feeding good though, he gained 11 lb in a week. I have colic drops now that will hopefully make a difference x

If it's only been the last couple of days it could be something else - bsbies tend to be extreme crying rather than grizzly with colic - where nothing soothes and they refuse a feed.

Now he's 3 weeks he'll be getting more alert and interested in things- so the feed eat sleep cycle now needs to include some play.

IMO wait to talk it through with your hv or gp before starting colic drops. There are a few things around just be sure what you're giving is what he needs - eg. colief- works on digesting lactose in milk if DS doesn't have this issue you don't want to make his body used to something he may not need. Whilst I know it's frustrating when baby is unsettled why not see how the next couple of days go. Try the massage techniques, reflexology points on feet to aid digestions - they really work!, Tummy time can help, a little more play and interaction.

Trial and error - don't just do new techniques when DS is cross it's too late by then!