What has changed for my 3 week old? Why is he crying so much?

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My ds is bottle fed and he is truly content when he is eating! He was small at birth (5lb 12) so I have been feeding him less than the guidelines. He is now eating 90mls approx at a time but looks for it about 8 times a day. Is this normal for him to be so hungry? I'm worried about him getting hungry so much. He is not wet or dirty, he just seems to settle when I feed him.

I think he is about 6lbs and a bit now, how do I know exactly how much he should eat?

Make up more milk and let him take as much as he wants. He knows bests about how much he needs. Also, around 2-3 weeks newborns do, in my experience, become a little more unsettled and its a classic time for colic to start. If you're really unsure, give your HV a call. Some of them are helpful. Hth

8 times a day is fine. It's three hourly, perfectly normal. And great if he's got himself into this routine already. Don't forget babies have growth spurts so there will be times he will feed and feed and feed, you will find you're feeding more often and upping how much he takes. It's all normal.