Vivipary automatically limits the number of offsprings in a litter. How?

Explanation

Vivipary is defined as the seed germination, while the fruit is still attached to the mother plant. Plants which grow in marshy places are called Mangroves. In these plants when seeds fall on marshy places, they cannot germinate, because of high salinity and more water conditions .
So, in those plants, seeds germinate when they are still attached to the mother plant . Litter is the off spring at one birth of animal usually 3-8 in number.
Vivipary automatically limits the number of offspring in liffer due to the reason that limited number of egg or ovum are produced and fertilised during reproductive cucle of female