OOo... just noticed this...
I gave Tia a spoon full of baby rice... (about a dessert spoonful) for the first meal... with loads of breast milk... Dunno how much, because I expressed it direct into the bowl... but it was enough to make it like the consistency of thick milk. I gave her one meal a day at around 3pm when she was due a feed... she got the food first then I finished with breast feeding her (mainly because she had a nasty habit of using me for a dummy and falling asleep and not fully eating and she would grump at me if I woke her)...
I only ever gave her baby rice at first (was too afraid to give anything else) because all the the other foods said from 4 months.... so when she got to 4 months thats when I introduced other foods like Mulipa sunshine breakfast cereal and different types of fruit/veg, like apple puree and carrot... Dunno if they still make it?
I started giving more to her when she seemed to demand more, not sure if that makes sense, but she would feed from both breasts require about 40mls of formula and still not settle for more than 20 mins ... she just seemed hungry... so she started getting breakfast around 10am and dinner around 6pm (mainly because dinner meant she slept better at night because her belly was full)...
Then when she was around 24 weeks she started cruising the furniture and that when I had to start with three meals a day because she was just starving all the time.
I just tried to give her a wide variety of foods... Usually the powdered ones you make up with milk, because they were cheaper (I was pretty broke) and I could use breast milk which made me feel happier that she was still getting my goodness so to speak... and I would follow the instructions on the packet as to how much to give her... and top her up with breast milk after wards.
When you wean early its all trial and error tbh... You try them with things, see how they go, if its too much then you cut back, if its not enough you try a bit more. As long as their weight is stable and they aren't under/over weight then there shouldn't be a problem.
Also you need to remember to offer boiled water when they start eating, because they get thirsty.