Weaning and organic food

Farmed without pesticides
There are hundreds of pesticides used in farming. Many are not really neccessary, except to produce more results on a cheaper budget.
These can leave a residue on the skin of vegetables and fruit, meaning you have to either peel or vigourously scrub them before cooking or eating. Others have been found to contain chemical traces: in oranges, bread, pears and grapes this is very common, and hard to avoid if you are not eating organic.
If you don't want to go completely organic or feel it's not financially viable, try at least to switch to organic carrots and salad products, as there is a higher risk of chemical residue in non-organic versions.

Additive free
Foods prepared for sale on a large scale often have sweeteners or colouring agents in them, just to make them a little more palatable or to look nicer or to last longer.
If you look hard at a label, you would be amazed how even something as simple as a can of red kidney beans or sweetcorn has sugar in it, even though it really just needs to be packaged in water.

The Soil Association, who are the UK's biggest campaigning and support resource for organic food and farming, cite only 32 food additives that are permitted for use in organic food. The EU approve 290 in regular foods. Additives like monosodium glutamate and hydrogenated fat creep into foods you wouldn't expect, and can have an affect on young digestive systems as well as your child's general weight and well being. Though you might not be feeding a new eater with foods that contain these, once you get into mixing basic fruits and vegetables into toddler meals, you might come a cropper. Even when you are buying 'pure fruit juice', check that it is just that: pure, and not made from concentrate with other things added into it.

Nutritionally better
Where farming has been less intensive and organic fertilisers are used, vegetables and fruit have been found to contain higher levels of vitamins like A and C, and other valuable minerals.
The same applies to meat which has been intensively farmed. Where possible try to source organic meats.
The health of a chicken can directly affect the quality in nutritional terms, of her eggs, so try to go for organic free range eggs too.