Actually, at this age I wouldnt be giving a baby petit filous or little stars. He doesn't need either right now as both have sugar in that can rot his little teeth
Natural yoghurt with fruit puree mixed is a good start to keep added sugar out of a baby's diet - did you know petite filous has over 12g of sugar per 100g in it? Way to high for a baby. It may even cause him to become over active.
This is taken fomr mumsnet:
"Sugar in yoghurts
Sugar laden yogurts marketed at children are a problem for parents - they've got dinky, bright packaging that our children love especially when they show the latest cartoon character. And they are often advertised as being suitable for babies from 4 months. BUT many of them are far from suitable with massive amounts of sugar.
Always look at the label and be aware of where sugar and fructose (another sugar) appear in the ingredients list. Petit Filous for example list sugar as its second ingredient and fructose as the 4th. The ingredients are listed in the order of priority from the largest amount to the smallest. So sugar and fructose are present in quite large quantities.
The good news is that several new yogurts are on the market that are naturally sweetened with fruit so you won't see any sugar included on the ingredients list. Try Little Rachel's yogurt or Mums4 for example. Or for a cheaper option, mix natural greek yogurt with pureed apple or pear"
hth