Easy on the tummy – I changed to this formula after baby suffering terrible wind pains and bloating. I found novalac colic immediately reduced the amount of wind my baby was producing. The only side effect is that he can become constipated so I need to offer cooled boiled water between feeds to help this. The formula mixes well but is very messy to clean off bottles - tends to stick and has a ‘claggy’ consistency. Overall very happy with this product.