Weeks 28-32 – Gestational Age / Weeks 26-30 – Fetal Age
** Gestational age is the age of the pregnancy from the last normal menstrual period (LMP) and fetal age is the actual age of the growing baby.
The fetus really fills out over these next few weeks, storing fat on the body and weighing about 4 - 4 ½ lbs by the 32nd week. The lungs are not fully mature yet, but some rhythmic breathing movements are occurring. The bones are fully developed but are still soft and pliable. The fetus is storing its own calcium, iron and phosphorus. The eyelids open after being closed since the end of the first trimester.
Source: American Pregnancy Association