I have always loved leggings from next for my boys. Purchased 3-6m son is 50th centile and have been able to use at 11weeks old with room for growth. Only thing I don't like is the seam for the elastic on the back how it's seen it makes a light bump, when a baby is on its back 80% of the day, design flaws like this could make baby uncomfortable. Not a major thing. Quality material and stretchy too.