Laying a baby down with a bottle contributes to ear infections, but it is the bottle and formula that are the bigger contributors.
Babies are designed to be breastfed, so the differences in breast and bottle feeding means that babies who are bottle fed,especially with anything sugary that grows bacteria easily, like formula or juice, will probably have about 5 times more ear infections (according to studies). Mother's milk has antibodies in it, so if it drains back into the shorter tubes in a baby's ears, is less likely to cause infection. But because of the position in which breastfed babies are held proper latch, and because the suckling action is different for when a baby nurses, he or she is much less likely to have milk drain into the ears. Also,besides the sugar in formula, most of it is made from cows milk, made for bovine babies that have several stomachs and weigh 100+ lb.at birth. In human babies, the cows milk can trigger a response similar to an allergic response that often includes increased mucus production (that backs up in to the ears and is perfect for growing bacteria) or skin eruptions (eczema).
A really good book on the subject is Healing Childhood Ear Infections, by Dr. Michael Schmidt. Using the information in that book, my daughter didn't get an ear infection until she was almost 4 years old, and she has had two in her entire 15 years. The other when she was about 6. She also didn't have antibiotics for either of those, which is another reason for recurrent ear infections...inappropriate use of antibiotics.
The American Academy of Pediatrics and CDC discourage the use of antibiotics in most children with ear infections for this reason:
http://www.aap.org/healthtopics/earinfections.cfm
http://www.cdc.gov/drugresistance/community/files/GetSmar...
Information on avoiding ear infections in the first place can be found here:
http://www.drgreene.com/21_768.html
http://www.askdrsears.com/html/8/T081600.asp
Both of these sites have advice for minimizing ear infections in a bottle fed baby as well. Not putting a baby down with a bottle is one tip. Positioning the baby with the bottle as if he/she were nursing is another.
Hope that helps!
K. Wildner
____@____.com
www.kimwildner.com