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I am not sure of this question very well.

However, keeping gap between two child (human beings I suppose) is part of family planning.  There are contraception and fertility control methods available and known to many nowadays.

Sterilization process - surgical
     In males - vasectomy
     in women - tubal ligation
For women  there are many methods, 
   harmonal contraceptives -  birth control pills, emergency (contraceptive) control pills,
   implantable contraceptives or rings
Barrier contraceptives
       male or female condoms

Behavioral  method
     By mating/having intercourse during the times when fertilization of eggs is least probable.

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