i normally give mine veg or fruit twice a week.
Its hard to explain how much, but about two small thumb nail sized pieces each (fingernail size for peggy)
your boys just might not fancy carrot, try a range of different things and hopefully they'll take to a few
Sweetcorn, baby sweetcorn, bell pepper, grapes and apple goe down well here.
Only Treo will eat banana, but he adores it!