I bought these for my admittedly small twins when they were almost 3 months old and starting to outgrow their newborn clothes. It's hard to find in-between sizes, so I was thrilled to find some 0-3 month sized pants that seemed to be good quality. That was December. It is now March, they're six months old, and these pants are STILL too big! And not just too long, but too wide around the waist as well. Again, yes, my babies are small, but they're around 14-15 pounds and have outgrown most of their 3 month sized clothes, too. Maybe these should be sized as 3-6 months instead. Still, for all that the sizing seems off to me, the pants are really nice, are very soft, and should fit them in the next month or so.