Adding the newborn cattle to the Nisab and Zakah on them

Q 4: If the Nisab (the minimum amount on which Zakah is due) cannot be completed unless the newborn cattle are added, should they be added (Part No. 8; Page No. 12) and would Zakah (obligatory charity) be due on them? Or is it necessary for the newborn cattle to pass the Hawl (one lunar year calculated from the time a property reaches the minimum amount upon which Zakah is due) before Zakah becomes due on them

A 4: Newborn and young cattle must be added to the old cattle to complete the Nisab and the Zakah is due on them all after the passing of a full Hawl from the time the Nisab condition is fulfilled. The fixed Zakah paid on all the cattle should be of the mature cattle as legally fixed.