The first trimester of pregnancy: - involves a rapid increase in cell size rather than cell number. - is the least critical time during fetal development. - is a time when nutritional deficiencies have little effect on the developing fetus. - is a time of particular importance to avoid nutritional deficiencies and insults to prevent harm to the fetus.

Is a time of particular importance to avoid nutritional deficiencies and insults to prevent harm to the fetus.

Explanation:first trimester is a vulnerable stage where there is even a risk of miscarriage if one is not taking precautions.

This is also a stage in which the baby is growing pretty rapidly and one need to take multivitamins and sufficient irons and make sure there is not shortage of nutrients supply to the baby .

The baby requires so much nutrients at this stage in order to develop further.