Hi, I have a child (now 30) who was completly dairy intollerant, and two grandchildren, one 8 and one 10 months bot milk intollerant.
I make most of their meals myself using soya milk such as chocolate orange rice pudding as I found pasta, potato, and fish meals all had butter/cheese or dairy added. Remember if you buy fresh meat and veg, you can do a mass batch of meals and freeze them. We did 36 meals last time, enough to last over two weeks, so you only need to do this every so often. The baby eats every single veg going, and we make some just veg, some beef, pork, chicken or turkey to give her different all the time.
We buy a lot of the alpro soya yogurt (not the one you can keep out of the fridge) as the baby loves the smooth ones. We also use soya butter, milk and cheese. Tesco do a soya cheese spread, which the baby loves on toast.
If you have a Sainsburys near to you you can find a lot of their free from range such as cookies, biscuits, fruit pies, cake, pasta, chocolate buttons, etc. They also do milk free ice cream, custard and cream. Holland and Barrett are good for soya chocolate and other bits as well, and also excellent for advice.
Certain religions will not mix milk and meat so you find good ranges of products dairy free in certain areas, have not tried but you may be able to find a cake in these special deli shops if you ask.
I have even found advent calenders with soya chocolate this year, but due to the high price I am going to make my own with the Sainsburys chocolate buttons. This was on Amazon.
When we went to the hospital dietician, she said I had more information, and better recipes than her.
Having spent years reading labels, and seeing how many products contain milk, when you don't expect it, you get used to recognising the brands.
Hope this helps.