We just put A in her ergo and set off on a walk but about ten minutes in I noticed she was kind of foaming around her mouth, kind of like bubble bath.... we loosened the straps a bit to make sure she wasn't too tightly in and then set off straight home. Once I'd wiped it away she did it maybe twice more but now we're home she's stopped. We've taken her temp and there's no fever. It is -4 here and it was windy so I'm wondering could it be a reaction to the wind? We'd wrapped her up warmly and put a winter cover over the top. She's 10 weeks. Any ideas what could have caused it?