Something I used to do with my daughter (now 3) was make up a huge batch of vegies, and throw in pumpkin, sweet potato, zucchini, broccoli, carrots, turnips sometimes, pretty much any mashable type vegies or whatever you have in the fridge! I would either boil them or steam them until soft, and then mash them with a potato masher until smooth. Once it was cool I used to use an ice-cream scoop and scoop what we called 'vegie blobs' onto trays and freeze them. Once frozen we used to just take them off the trays and store them compactly in plastic bags (but I will definitely have to try zip-lock bags for my number 2 when he starts on vegies - great idea!). These make a really good base for adding pretty much anything, or even having on their own, we used to give her one for lunch and then one for dinner with meat either mixed in or on the side, then fruit purees done in ice trays for dessert. I found that a large batch ie. One whole or half a pumpkin, 3ish sweet potatoes, 2-3 carrots, a broccoli flouret and 4-5 zucchini, would do us for a couple of weeks. This means you are not cooking all the time and they are soooo easy to use. To reheat we used to just chuck one in the microwave for a little while (its been 2 years, can't remember exactly how long!), abviously make sure it was not too hot and....voila!
Hope this helps!
Danielle, Vic, Mum of 3