My mother talks and acts like a child. I'm really concerned about this. When I go to visit and we're relaxing watching tv/I'm browsing my phone she'll say nonsensical things and make noises get attention. She does it most of the time too, and in public which is awfully embarrassing. She says 'broche', (really not sure what that means???) 'oh dearrrrr', 'yoohoo', coos at the television and repeats words characters are saying all in the voice you'd use when talking to a baby or a small animal. She sits and stares at me or her partner and wags her finger at us bouncing up and down in her chair to get us to look at her. She slaps her lips together when being presented with food and shouts 'yummy!'. She also does childish things like prod at her partners phone whilst he's using it and fake cry if she hurts herself and begs her partner to kiss the 'boo boo'. Generally just behaviour I would expect to see in a toddler at nursery. It's highly annoying and very worrying as she is in her mid 40s. She is never around any children either so doesn't have to act like this in her daily life. I feel she needs to see a health professional. Any advice?