Question What would solve this fit problem in a T35?

My daughter is 4.5 mos, 26", 14 pounds. Her torso is pretty short though...at birth she JUST fit the T35 by strap height and she was 21" and over 8 pounds! Anyway, as she's gotten bigger it is harder to get a good strap fit. Her shoulders are narrow and when she naturally slumps into the seat, the straps are fairly easy to pull off her shoulders even when tightened correctly or over tightened. When she slumps into the seat, she is about 1.5" below the second slot but still far enough above the first slot that the straps are way down. When I put her in before the slump she is even with the second slot. This would be solved if there was another crotch buckle position closer in to the baby, but alas there is not.

I can tighten the straps and have them sit properly when she's in just a sleeper, but I'm concerned with winter coming about what to do. If she's wearing ANYTHING thicker like a cotton sweater, thin fleece, or overalls, then I have an issue with the shoulder fit.

My baby is 95% height and 75% weight, do I never thought I'd have a harder time fitting a car seat than I did with my son who was much much smaller LOL.

Is there anything I can do about the slumping into the seat so I can move the straps up?

Hard to believe a newborn baby can grow 5" and still be on the same shoulder slot...eeek LONG legs!

You can roll a washcloth and put it between her body and the crotch strap. That will prevent the slumping. Also make sure not to overtighten the harness, as that can actually exacerbate straps falling off the shoulders, and make sure the chest clip is high enough.

Thanks so much!

How long can I use the rolled washcloth? Indefinitely? For some reason I was thinking that was a sub optimal solution only for teeny babies...not sure why.

What is the dividing line between properly tightened and over tightened for a little one? I tend to err on the side of more rather than less when I'm not sure.

You can use the crotch roll as long as it is needed. At some point, baby will start pulling it out, or it just won't fit any more, or baby simply won't need it.

With a properly tightened harness, you cannot pinch a horizontal crease in the harness over baby's collar bone. Your fingers will just slip off. There's no real definition of overtightened, although of course if you are leaving marks on baby then it's probably too tight. I would go for just tight enough, no more.