Mixing cereal for babies on Shabbos

Hi,

One may not create thick mixtures on Shabbos. One who has a great need for cereal for a baby may mix cereal with liquid, assuming that he (1) makes the mixture loose rather than dense, and (2) adds the cereal and liquid in the reverse of the normal order.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:74: Lash 3)

Have a great day,
Mordechai