My DD has carrycot rage, she screams (high pitched like she is in physical pain) the entire way round a shop until I am too embarrassed and leave or take her out and she stops instantly. She doesn't do it in a sling but she's getting a bit heavy for me now and I'm pretty certain she wouldn't do it in the upright/reclined pram attachment for our travel system because I think she just wants to see what's going on. She's long and thin so the straps are just a tad too big, is there a reason why she needs to be 6 months to be in it (which is what I've noticed manufacturers all say)? She has excellent head control. Is there anything I can do so the straps are more snug?