Our DD is 4.5 months and really doesn't like being in either. There is the odd exceptional day when she doesn't seem to mind, but mostly she starts grizzling which often leads to full-on hysteria. I can - and frequently do - carry her in the sling instead of the buggy, but she's getting really heavy (7.5kg!) and walking everywhere with the weight of her on me has made an old knee injury flare up again. And sadly there's no alternative to the car seat, so car journeys are awful as I can't get her out to cuddle/comfort her (or I can, but it means frequent stops).
Does anyone have any advice? I'd love any help or ideas. I should probably had that she has silent reflux but it's been being treated with medication for the last 7 weeks (very successfully, it seems - but possibly this behaviour is actually reflux-related?)