At about 19.5 pounds, Sadie's still below the top weight for 3's (28lbs) and the bottom weight for 4's (22lbs), but I think we might need to graduate...? The 3's still fit with plenty of room in the waist, but she's starting to get some contact dermatitis on her hips and she had two leaks yesterday (she hasn't leaked in forever). I'm thinking we might need to size up, but I'm afraid they will be huge since she has a tiiiiny waist.
How long/at what weight was your LO in size 3? What's your cue to size up?