I sell tupperware and the icetrays are perfect for freezing bubs food and EMB and yes you can then just pop the cubes out and put into another container in the frindge (more tupperware perhaps?) They have a new icetray (new to the spring/summer range) which has little silicone 'nipples' on the bases so you just push the soft nipple and you can pop out just the one cube instead of having them all fall out when trying to get the one out. Oh, and it still has the lid to stop freezer smells/taste and burn too.
Tupperware is great for kids foods and freezing coz they have made surethat there is nothing harmful that is going to 'leak' into the foods stored in it.

HTH