How to say preemie's age

So my son was 11 weeks early and is now chronologically 3 months (3 weeks adjusted I believe). His due date was about 3 weeks ago. He's 3.8kg (8.3 lbs). When people ask for his age, I get flustered and say 3 months but he still wears newborn clothes. So I say 3 weeks old sometimes and I still get looks. How do you say your preemie's age?

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