The last one is the variable flow nipples which adapt to your baby's feeding style and can be used with thicker fluids. (thehomeclone.com)
The variable flow nipple features a Y - cut design that adapts to your child's feeding rate and is ideal for thicker fluids. (shrewdmommy.com)
To make a sensory bag, you'll need a sturdy gallon - sized freezer bag (or two if you want to double up for extra peace of mind), in some cases some sort of thick fluid to fill the bag, and small items for baby to look at and touch. (candokiddo.com)