My baby started saying "ma" 2 weeks ago, then "mum" and now "mommy" my SO clearly heard it earlier…

My baby started saying "ma" 2 weeks ago, then "mum" and now "mommy" my SO clearly heard it earlier while he was holding her and in the morning my MIL was holding her and she said "mamy". I thought it was my imagination but no they both heard it clearly and my MIL was the first to say that she said "mum" when she was taking care of her. It's crazy. I wanted to cry.