See my earlier question and the answer given by my friend Flute.
http://in.answers.yahoo.com/question/index;_ylt=AsaZJvt2VIDVNuFOESmH87yQHQx.;_ylv=3?qid =20120410222450AACi1vV
We have to think that plants and amoebae also have life. Some plants will grow when we cut their branches and replant in the soil. Can you say that the soul of the mother plant divides when each branches grow? Can you say that an amoeba has many souls when it cultivates?
Edit;
From where 'is it true' got such information? Will all the religions agree that 4 months is the time to enter soul into the body? But which day, which hour, which minute, which second? Where is the proof?