size up. 6/6Γ are usually baggy to fit my 6 year old perfectly but this size was more suited to a 4 year old. The fit down to the waist was good, but the upper sleeves were a quarter length and the lower sleeves came down to the calves.
Pros
Our baby is rather small, she can grow into it. Basically we are satisfied with the product.
Cons
I bought the 3T for my 2 year old assuming I will have it for 6 months. But to my surprise it didn't even fit my 2 year old.