T Shirts import companies and t shirts import trade opportunities Baby Products

I’m looking for a factory to manufacture my new brand! Children and teen jeans, leggings, jumpers, T-shirts etc I have designs and tech packs ready

Can you produce childrens tshirts with a design provided to you? I would need girls sizes from 4 years to 10 years. I would need accessories attached to them. Can the factory source these accessories? Also, what are the freight/ import costs to the UK?