My husband's relatives are of view that a healthy newborn should have a birth weight of at least 3kg. My lo was born at 2.6kg, full term, and is having serious reflux issue. Feeling sad that they associate her birth weight with reflux. How can I convince them that the reflux is not due to their lower-than-expected birth weight? Or is it really true that a lower birth weight makes a baby more prone to issues after birth? Thanks.