"gastrofunzionale" simply means here that it helps the gastrointestinal tract work better, i.e. it helps digestion. The suspension bit is repetitive - after all they are drops! They usually contain probiotics (fermenti lattici) and/or simethicon or other anti-foaming agents. The translation may also hinge on the ingredients in the liquid. It may be specifically for flatulence or for pain, in which case you might want to tailor your translation accordingly, to stress its gas reducing or soothing effects.

some ideas:
Amazon.com: A natural herbal digestive aid for babies, to ease the ...
www.amazon.com/natural-digestive-discomfort-hiccups.../B00B...‎
Amazon.com: A natural herbal digestive aid for babies, to ease the discomfort due to colic, gas, hiccups and teething - Baby's Bliss Gripe Water, Liquid, 4-Ounce ...

GERBER® SOOTHE™ – Colic Drops Probiotic Supplement | All ...
www.gerber.com › Home › All Stages › Products › Formula‎
Colic is relatively common among infants and all infants occasionally experience ... GERBER® SOOTHE™ Colic Drops contain Probiotic L. reuteri; It has been ...

Treating Colic with Probiotics - Colic Calm
www.coliccalm.com/baby_infant_newborn.../probiotics_for_col...‎
Probiotics can be a helpful tool in the treatment of colic, reflux, gas and other ... their products contain probiotic additives to help deal with digestive problems.