This is Annabel Karmel's recipe for chicken stock:
1 large boiler chicken plus giblets
2 parsnips, 3 carrots, 2 leeks, 2 large onions, 1 celery stalk, 3 sprigs fresh parsley.
Cut chicken into 8 pieces, simmer with veg in 2.25 litres water for 3 hours. Leave in fridge overnight and remove congealed fat from top. Strain out chicken and veg to make stock, Season to taste.
You can puree some of the chicken breast with some of the vegetables and stock to make a chicken and veg puree for oyur baby.
Stock and puree can be frozen.
I found it was easier to buy chicken pieces rather than trying to hack a whole chicken into pieces.
Alternatively, you can make veg stock: saute veg (similar mix to above) in butter for 5 mins, cover with water and simmer for about 1 hour. Strain off vegetables.
HTH.