Before the meal we tend to be under 10 (e.g. 8-9). We cannot give him pre-bolus since we do not know how much he is going to eat at the end. For the milk we give pre-bolus for 100 ml since that he will drink for sure then the rest is added afterwards.
This last sentence I do not under stand it quite. How does that work? He was diagnosed 2,5 months ago, we are still new in this... Why would protein turn into BG?
8 or 9 is quite high. Insulin has a harder job to do the higher the bg level is, so starting at 8 or 9 and then feeding means it will be having an uphill struggle right from the start, and the higher it then gets, the harder it gets to bring it back down. I'll usually try to be about 5 or 6 before eating as that is the usual between meals level to aim for.
Of course, that's just my take on it as an adult - there might be specialties involved in paediatric T1 which I'm not aware of, so, obviously discuss with professionals.
Gluconeogenisis? Carbs break down into glucose. Glucose is the primary and preferred source of energy. So much so that if the body isn't getting enough glucose from carbs, it'll break down protein and then make glucose from the amino acids via various chemical pathways. It's why people who do low carb diets still need to inject insulin. It takes a while for the comversion to happen which can lead to unexpected highs. I have no idea whether 8g per meal is too much or too little for a baby. If too little, then gluconeogenisis might be playing a part.
www.ncbi.nlm.nih.gov/books/NBK22591/
Shame about the pre-bolusing - it can make a real difference. Sometimes, if I'm eating out and am uncertain when the meal will be served or the portion size in a new place, I'll pre-bolus a small amount so there's at least some working. Might be an option if you're uncertain how much will be eaten.