Firstly, veggie, vegan or meat eater is entirely up to the individual.... all three have advantages and disadvantages... do what YOU think is right.
I haven't had a chance to read the whole thread so sorry if this has already been mentioned but Alpro have just bought out a toddler soya milk for 1 year + that is fortified to have the extra fat etc that children need so can be used to completely replace dairy milk. So you can now go from formula straight onto toddler soya milk at a year without needing to worry about dairy (as regular soya milk can only be used as a main drink from 2 years due to it's low fat content). I'm veggie myself but eat an almost completely vegan diet and my hubby is vegan and we know many vegan children - all perfectly healthy. Vegans I find tend to be very clued up on nutrition, far more so than the average person. The main potential trap is to fill baby up with too much high fibre/bulky low fat food and not enough protein/fat etc. Giving fat fortified soya milks, high fat veg like avocados, not scrimping on cooking oils, nuts (when age appropriate), high fat spreads like hummous/peanut butter, using full fat vegetable spread etc can all help with this. A good multi vit is a great idea. The Vegan Society make one called Veg 1 which is great and can be taken by kids and they also have a book about raising vegan children which is very good. Make sure you have a reliable source of b12 in the diet (should be no problem as can be found in fortified cereals, plant milks, marmite etc etc), a source of iodine (sea weed, especially kelp is great for this, you only need small amount or vit pill) and vitamin D (Vitamin D2 is vegan as it's from plants - get plenty of sunshine, is added to pure vegan margarines and plant milks and use a supplement in the winter. The Vegan society can advise you where to get D2 as most in the shops will be D3 which is only veggie as it comes from sheep's wool).
So do your research hun but go for it! My little man is veg at the moment (as he's FF) but I hope to have him on a mainly vegan diet at some point in the future.
And OP - people don't understand veganism and there are so many false ideas about it and just plain wrong nutritional 'facts' about needing meat and dairy that simply are not true. Do not let people get you down! and tofu cheesecake rules! and apple pie with alpro soya custard... yum yum! Swedish Glace vegan ice cream with apple strudell... am making myself hungry now!!!