As the baby becomes familiar with taste and the technique of feeding you can increase the rate of feeding. Make sure the formula doesn't get too cool or the baby will refuse it before becoming full. The number and amount of feeding depends on the age and size of the baby. A rough guide would be 1 - 2cc of formula for each ounce of body weight each feeding. Each time after feeding, the baby needs to be stimulated to urinate and defecate by gently massaging the lower abdomen and rectal area with a warm, damp tissue.
Diarrhea can occur and lead to dehydration.
Substitute several drops of plain Kaopectate for a feeding or two. The amount depends on the size of the squirrel. Offer cooled boiled water instead of formula but don't withhold formula for more than 6 hours. Sometimes additional medications must be given. Ask your veterinarian if the diarrhea continues past 12 hours.