What happened to my calm baby 😩

Mia

So out of no where my almost 6 month old will not let me put her down, she use to be so good just chilling with all her toys and play mats and she would only cry when she was sleepy, but now she only wants me to hold her I’ll sit with her in my lap and she’s happy as can be I put her down and leave for 1 minute and she starts crying, is this some type of leap ? Any one else experiencing this ? I read it could be separation anxiety but I’m a sahm so not too sure if that’s it