How old is normal for a baby to have a tummy?

Tummy saving refers to the phenomenon of not having a bowel movement for a few days. It is normal for babies to save their tummies within 6 months, and parents should distinguish between tummy saving and constipation when babies do not have a bowel movement for a few days.
Tummy saving starts when the baby is about 2-3 months old and can last until the baby is 4-6 months old, usually it will end when the baby starts to add complementary foods. If your baby has been eating complementary foods for a while and still has tummy troubles, you should consider that your baby is suffering from constipation or other diseases.
When the baby does not have a bowel movement for a few days, the parents are not sure whether the baby has a tummy or is constipated. In fact, the parents can simply judge from the shape of the stool, for example, when the baby has a tummy, the stool is softer and when the baby is constipated, the stool is harder.
If the baby does not have a bowel movement for a few days, parents can observe for the time being and not deal with it; if the baby has abnormalities or constipation problems during the period of tummy saving, you can take the baby to the hospital for consultation.