Hi, My baby is almost 13 months old. Swollen guns and general unhappiness indicate teething Is occurring. We also get periods of a very happy content baby. Whole milk was introduced just prior to 12 months and he takes the fine. For the last week we have had the a vomit once daily, normally first thing in the morning. It is generally quite thick and white and I m assuming it burns as it comes up. We also have yellow stools .