(I've actually never responded to anyone's questions, so I hope this comes out okay...)
I know it is difficult. All of my 4 kids spit-up and one more than others--she didn't ever burp well enough, so our pediatrician showed us how to sit her on her bottom and gently rock her back and forth after feedings until she gave a good burp (kind of like helping her with sit-ups). Stopping occassionally to just rub her back in circles... Worked like a charm for her...
Here's a part to an article I found that may also help:
Hobbie, C., Baker, S., & Bayerl, C. (2000, 2000 Jan-Feb). Parental understanding of basic infant nutrition: misinformed feeding choices. Journal of Pediatric Healthcare, 14(1), 26-31. Retrieved September 6, 2009, from CINAHL database.
Normal spitting up
Spitting up or mild reflux is very common in infants. Twenty-nine percent of mothers surveyed believed that the most common cause of frequent spitting up was a milk allergy, and 37% did not know or did not answer the question. If a baby is gaining weight well, does not have recurrent pneumonia, has no blood in the stool, and does not appear to be in pain while eating, no intervention is necessary. Health care providers can reassure parents that spitting up is normal and that most babies outgrow it by approximately 1 year of age. About half of normal 2-month-olds spit up twice a day or more. This incidence decreases dramatically after children learn to sit up. At 1 year of age, only 1% of infants continue to spit up (Balistreri & Farrell, 1983). A small percentage of babies will have more serious reflux that may cause failure to thrive, aspiration pneumonia, blood loss, or pain with eating. Some babies arch their backs and cry out. Infants who are spitting up and demonstrate any of these symptoms should be evaluated by a pediatrician or gastroenterologist (Colletti et al., 1995). Even when spitting up is normal, it is a frustrating and messy problem for parents, and health care providers need to acknowledge parents' frustration and give them whatever tips they can to help minimize the problem. Some interventions that might help include making sure the infant burps well, handling the baby very gently after feedings, giving smaller, more frequent feedings, putting a folded blanket under the head of the mattress in the baby's bed to elevate it approximately 30 degrees, and thickening the formula with a small amount of rice cereal. Weaning breast-fed infants who have a tendency to spit up is not necessary. Putting the baby in an infant seat where the stomach is compressed is not beneficial (Balistreri & Farrell, 1983). These suggestions will help the parents feel that they are doing something to comfort the baby.
When an infant spits up frequently, the temptation is great for parents and health care professionals to switch from breast-feeding to bottle-feeding or from one type of formula to another. However, it is important not to discontinue breast-feeding or switch formulas. Unnecessary changes are often made to more expensive formulas or to low-iron formula. The unfounded perception of ill health can also cause increased maternal anxiety and contribute to an adverse attitude in the mother toward the child (vulnerable child syndrome). This attitude on the part of the mother can persist as the child grows older (Forsyth, McCarthy, & Leventhal, 1985).