8month still won't sit

Yes normal. Every child has their own milestone timing. You don’t need to train or teach, and pls don’t force cos it will strain their back /injure themselves. Once their muscles are ready, they will do it.

Just keep practice him to sit .. may be a high chair may help .. with proper support.. he will reach his mile stone soon ..

Yup. Don’t worry about it. My lo still rolls over at 8months. Only managed to sit up unassisted at 10 months

It's normal. Take it slow. Do not force it as baby might be hurt.

Yes it is normal. Every child learns at a different pace