Answer:
   
   Alas, few of the major manufacturers make a line of baby food
   specifically for Pesach, although in some areas a few manufacturers
   do. A local "kosher store" just before Pesach would probably be your
   best bet. However, you should check with your local rabbi or halachic
   authority, because there may be leniencies available -- on a local and
   limited basis only -- for products such as baby cereal or formulas.
   However, you should not use such products without consulting your
   rabbi.
   
   Note: You may be in the position of having to make your own. Another
   potential avenue is to check some of the online Kosher grocers, such
   as [5]http://www.koshersupermarket.com/,
   [6]http://www.wholesaleportal.com/. [7]http://www.kosherfinder.com/,
   [8]http://www.kosherfoodsdepot.com/,
   [9]http://www.koshercornucopia.com/, or
   [10]http://www.kosherfest.com/.