The most "dangerous" stage of prenatal development in terms of infant viability is the stage.

The most dangerous time for teratogenicity of the fetus is the first 3 months of pregnancy. At this time, the fetal development has not yet taken shape. It is now the early stage of pregnancy. The pregnant woman's resistance is also poor, and it is easy to be affected by bacteria and viruses.

Tigers do not hibernate. It is not a biological need of any members of the cat family.