Yes you will need to buy 0-3. You might come across other stores, like H&M do a 2-4 as well, which I find fit 0-3 as well.
Honestly I’d so confusing why can’t they just make it all the same thank you tho girls 😂
From my experience, Tesco clothes are true to size, but for your child's age. Pennys are small fitting buy the bigger size Next are bigger fit .... wait for them to grow into them 😁
Its because tesco do "newborn & up to 1m" so the next size is 1-3 (which id say is 0-3) 😄x