My oldest granddaughters are 3 year olds. They can’t address an envelope or buy a stamp or write a sentence on their own.
The only reason we get mail from them is because of their parents. My dear daughter, daughter-in-law and sometimes even my son, make time and provide materials needed to communicate with us. (We are blessed beyond words.)
And how does this relate to prayer? We can’t do it alone either. The Spirit helps us in our weakness. For we do not know what to pray for as we ought (Romans 8:26).