In certain women oviducts are blocked.Such women cannot bear babies because sperms are not able to reach the egg for fertilization.
For such parents,the medical science has developed a
technique called in vitro fertilization or IVF(fertilization outside body).
In this method a freshly released egg and sperms are
collected and kept together for a few hours.fertilization of the egg by sperm
is successful,the zygote is allowed to develop for about a week.The development
of zygote is then placed in mother’s uterus.The further development of zygote
and embryo takes place in the uterus of mother.
The baby is born at the
appropriate time like other babies.
The babies born through IVF are called test tube babies.