A squirrel really should NOT be eating fruit at this age period. Formula and blocks ONLY. Then you start with the green leafy stuff that is from the healthy diet. Once eating the blocks and green stuff VERY well, not just shredding, you start with other vegetables and then move to ONE small piece of fruit per day and/or ONE nut per day. Nuts and fruit are purely treats for captive squirrels and hold NO nutritional value. Feeding fruits this early makes them not want to eat their healthy foods. This should have been the FIRST response that you got!!
Yes the fruit probably upset her tummy and caused gas. More than usual will also make them too full. Formula is your main concern at this age. Then blocks. Bananas aren't the best fruit to give if you're going to give fruit either. Here is a link to the healthy diet and the calcium to phosphorus ratio list. The idea is to keep a 2:1 calcium to phosphorus ratio in their diet. Meaning that they should get double the amount of calcium than phosphorus.
Cative squirrel diet pyramid:
http://thesquirrelboard.com/forums/s...(Revised-2-13)
Ratios:
http://thesquirrelboard.com/forums/s...sphorus-Ratios
You should also read through the nutrition forum. ALL of IT!! It's extremely important for cative squirrels as they are very prone to MBD which causes severe pain and inevitably death.
Nutrition forum:
http://thesquirrelboard.com/forums/f...rrel-Nutrition
We DO NOT recommend fruit in formula or in anything else here!!!
(An exception may be if we're having trouble with diarrhea, constipation, eating at all or dehydrated and the squirrel won't take fluids. Otherwise, no fruit...)