ANSWER:

The first niyyah for the first day is sufficient for the whole month as long as you didn’t break any day in the middle by traveling or falling sick. 

You must not say the Niyyah with your mouth. 

 

Is it obligatory to make niyah (intention) everyday to observe fasting in Ramadan? Or, my niyah before the begining of Ramadan for observing fast in the whole month seeking pleasure and forgiveness of Allah SWT is sufficient?