my ds often regurgitates some of her feed. he's putting on weight well and is healthy but the constant vomiting is getting v stressful. dr gave him gaviscon which makes some difference but worried as it can raise sodium levels so don't want to carry on with it. i've heard that adding baby rice to the bottle can help stop regurgitation. ds is 4.5 months old - is this ok to do and will it work? if so how much do i add?