Is it normal that babies can already carry herself/himself while sitting in just 3months?

There are some babies who can already carry their head up high and sit comfortably at 3 months, but make sure may support pa din. Jumperoos are designed for babies as early as 3-4 months as long as they can support their own neck already.

It depends as each baby is different. But don't force the baby to sit by himself. Always give him support to avoid any accidents.