Please can someone who knows a bit more about babies tell me if it is normal for babies to display 'stranger danger' at 4 months, or if something might have happened? According to raising children, I thought stranger danger was 7-9 months and other reputable sources say it is even later.
My in-laws came over to babysit for an hour so DH and I could go get a cup of coffee and have a chat (very sweet). FIL was holding my baby while I was in the next room explaining where everything is located when all of a sudden she started screaming hysterically. She was really, really upset and I haven't seen her react like that before. After consoling her and checking she was ok, we still decided to go for coffee down the street. We were only a short walk away and they were under strict instructions to call us if she got upset again. Apparently while we were away, she was looking around for us and when she realised we definitely weren't there she became upset again (I am unsure if this is true or not? Maybe they didn't read her signs well?). While I have been able to comfort her, she had difficulty sleeping last night and would wake up screaming.
She has never reacted like this when my mother cares for her while I go to the supermarket or go to park the car. Even in social situations when I let other people hold her, she absolutely loves it and chats and laughs away with everyone. She loves socialising and meeting people.
So, is it normal for a very social happy baby to suddenly get stranger danger early? Obviously, they aren't babysitting again (which has hurt my DH feelings)!