MTDT,
i found this article. I think my daughter have this last time. That could be the reason she cant sleep well.
About Gastric Infant Reflux
Gastro-Esophageal Reflux (GER) causes severe heartburn pain when milk and stomach acid flow backwards up into the esophagus. Normally, gravity keeps breast milk or formula in the stomach, but when a baby lies flat, the stomach contents are allowed to reflux back into the esophagus. During sleep, this acid irritation will cause frequent night waking, pain, excessive spitting up, and restless sleep patterns.
How common is GER?
In the early months, around two-thirds of all babies have some degree of GER, which accounts for the frequent spitting up that most babies have. The spitting up does not usually bother these babies, dubbed happy spitters. It is not painful, does not slow weight gain, and is more of a laundry problem than a medical one. GER becomes a problem (called GERD gastroesophageal reflux disease) when it causes painful irritation or damage to the esophagus, interferes with growth and development, interferes with feeding and sleeping, and/or contributes to respiratory problems.
How long does GER last?
Symptomatic GER usually starts between two to four weeks of age, peaks around four months of age and begins to subside around seven months of age, when babies begin spending most of their days upright, start solid foods and by the law of gravity, food stays down easier. Most infants will outgrow GER by one year of age I call this walking away from GER. Yet, in some children, GER continues throughout childhood, and sometimes into adulthood, where it is manifested more by heartburn and wheezing episodes.