Just pass by.
My daughter had the same situation before (3 year ago). I don't know why but I believed 開奶茶 is good so I kept on feeding her every Sunday
Later on my new baby sitter said there're some ingredients which are not suitable for her so she puked. After then she helped me to prepare the 開奶茶 with her faimiliar pharmacy then no more puke But I don't know what they added in or taken out.
But as Catstanley said, "如果bb係健健康康既, 就唔洗開呢d野比佢飲"