mik mik for milk came about as a result of the Cravendale advert. It was on when DS3 wanted a feed, and all the older dc were saying 'milk milk' like the advert, we found it amusing, so it kind of stuck and we said it at every feed...
ojjjj ojjj is for his orange blankie, and woe betide me if I give him one in a different colour. He will sit there and say ojjj ojjj ojjj until I get the orange one, then he hugs it, smiles, and says ojjjj ahhh.
I think he got the 'j' sound early as DD's name starts with a 'J'. And he loves DD to bits, she's like his second mummy!
Bubbles came about because my 2 dc with SN play with bubbles A LOT. One day when they were playing, he was sitting up and 'popping' them by clapping his hands on them. Next day, he could see the bottle, was waving his hands in that direction, but we couldn't work out what he wanted. He kept going bubbbbsubbbubbbbsubb. Then, clear as day, he shouted 'bubb-ows'. As soon as DD got the bubbles and started blowing them for him, he clapped his hands, smiled and stopped saying bubbles, and concentrated on popping them. He's said it almost every day since then.
I hope I don't sound boastful - I have had to contend with 2 dc that had speech and language delay too, DS2 didn't say anything until 3.5yo, only had 2 words on his 4th birthday. Though he's making up for it, this last year since he turned 7yo. My ears hurt...
Every child is different - I think early speech is 'normalised' in my family though, my 20yo Dbro (has Aspergers) first spoke - to me, not my mother - when he was 10mo. We were in a curtain shop, I was looking aftre the buggy while my mum was in an aisle the buggy wouldn't fit in, and Dbro couldn't see her. He looked at me, and clear as day, said "Where's my Mummy gone, I want my Mummy".
DS1 was very similar to the way DS3 is, by the time he was 2yo, he was able to hold a perfectly crystal clear conversation with anyone.