Hygiene at all times is essential. The teat should be always sterilized before use. An enormous number of germs can lodge on a single teat: in this way, disease can be readily and rapidly transmitted to baby.
This is even more likely during summer. At all costs, the teat, both before and during the feed, must be adequately protected from flies. Flies settling on baby’s bottle teat even for a few seconds can allow enough gastric for other) germs to be left behind to produce illness.
The hole in the teat is very important If the hole is too big, milk will spray out at a far greater rate than baby is able to cope with. If this is the case (and you should always test the rate of flow), get a new teat. A gentle, constant drip is all that is required.
A teat with too small a hole is also inadequate. It means baby has to suck too hard to get his meal. He may tire quickly, lose interest, and perhaps have inadequate food intake. In an hour or so, he will be yelling for more food.
Violently sucking at a small-holed teat can also allow him to swallow much air, which can produce discomfort.