Our nanny search from @#$ continues and meanwhile we've hired a summer nanny. College girl, seems nice although quiet, good references. She carries our baby around a lot during the day. Today was her third day. After she left tonight, I noticed a bruise on the baby's thigh, right where you would hold her. I looked further and then saw some stripey bruises on her wrist that look like they fit right between fingers--if you grabbed someone's wrist. Nanny didn't mention anything--said it was a good day. Didn't say, for example, "oh, the baby started to fall and I grabbed her" or anything. DD (age 4.5) is unreliable but says that Baby didn't get hurt and BAby wasn't crying a lot today or anything and that the nanny wasn't real mad about anything.
Before I call/ask the nanny, what do you think? I really can't imagine she was trying to hurt the baby, but clearly this is extremely concerning. We've never left bruises ourselves from carrying the baby around, nor have other nannies.
What do you think? How would you handle this?
ETA: for mobile--the baby just turned 6 months old.