Is this type safe and been used in infants of around 4 months? my baby is 4.5 months old now and absolutely vetoed the homemade goats milk formula last night. she spat, blew raspberries, fake gagged, pushed it away, etc for about 15 minutes to illustrate exactly what she thought of that bottle. ive had her on variations of it for the past few days. the ones that include oils aggravate her reflux really bad. ive tried the dr sears version which she stomached better but...