I know this sounds like a really stupid post, obviously when the clothes get tight they need the next size up, but if they are say 2-3 months and 0-3 are a perfect fit, do you wait until they are too tight before moving on to 3-6 completely? Do you mix sizes? Or ignore sizes and base it on what fits comfortably regardless of label? My baby is still in 0-3 months but the feet are getting tight, 3-6 months are long on her although fit well in other parts. It’s not something I considered until now as she’s worn 0-3 since birth and all shops have different measurements. Thanks