I usually mix an 1/2 oz of tea with 1 to 1 1/2 oz of bm, and feed it from the bottle. They also make Baby Bliss Gripe Water sold in health food stores. That has fennel and ginger in it to help with colic or gassy bellies. My dd is almost 5 mos old.
From a colic help website...
A traditional European remedy, gripe water contains safe, fast, effective, natural ingredients for relieving colic discomforts. Gripe water has been used by mothers for over a century to provide relief from the discomforts of colic, stomach cramps, hiccups, gas and teething.
The traditional natural remedies Fennel and Ginger are contained in Baby's Bliss Gripe Water. Both have long been shown to be beneficial for easing nausea and pain due to baby stomach gas and other symptoms of colic. Fennel and Ginger are also effective for the discomforts of infant teething, gas and hiccups. Relief usually occurs within 5-20 minutes.