Just that really. I’m a first time mum and my son was very prem so it’s kind of been drummed into me to look for delays. He is 16months corrected now. So for example, he will call me ‘mummy’ and I’ve never been called anything else by him but recently has fell in love with Bluey and he gives me the remote and goes ‘MOM’ just like the theme tune … when it comes on he goes ‘MOM’ then ‘Tttttt’ like he is trying to sing the little song. So long story short is mummy and mom one word or two because clearly in his head they mean two different things? Same with Hiya and Hello … funny when we play phone he answers it with a hello which I suppose I do but then face to face he goes with hiya. But given they mean the same thing is that one or two words?