Mother's milk teas usually contain fenugreek and blessed thistle and other helpful ingredients. so you may have just been taking a little bit too much fenugreek with the tea plus the pills that made baby be a bit fussy/gassy.
Realize that often it isn't the actual fenugreek that makes baby fussy/gassy, sometimes it's the increased milk--which means more foremilk that baby is taking in. Hindmilk slows digestion so the lactose in breastmilk can be digested easier by an immature gut.
I will also say that if you are nursing as well as pumping, getting 20 oz is really really great! most breastfed babies, regardless of sex, age or size, never take in more than about 25 oz a day on average 1 oz per hour. the range of total intake is 19-30 oz, and after starting solids the ounces begins to drop. So if you are at daycare for say 9 hours, most babies would only take in 9 oz during that time. if yours is taking in more than twice that amount, consider that overfeeding may be occuring.
there are hints to slow down feedings that may help, like taking at least 20 minutes to feed a bottle, since it takes about that long for the brain to get the signal that the stomach is full, slower flow bottle nipples, sitting baby upright when feeding and tilting bottle downward so baby has to work to get the milk like they do when breastfeeding, as well as frequent stops every 1/2-1 oz to burp for several minutes and change sides you hold baby on to stimulate both sides of the brain and simulate breastfeeding switching sides. also it is more normal for a young baby to take in small amount of oz 2.5-3 hours more frequently, just like it's healthier for adults to eat small amounts more frequently.