Week 33
The immune system of the fetus is borrowing antibodies from you. Skull bones stay soft so the head can mould in labour. That is design, not fragility.
Length and weight
Length43.7 cm
Weight1900 g
Early weeks are crown to rump; later weeks are head to heel. The bar is not a ruler. It is a rough comparison with the average at week 40.
Approximate
Ask your midwife or doctor before you change medicine, herbs, or a birth plan.
Related
The third trimester
The work now is pattern: movement, swelling that is ordinary, and swelling that is not.
Sizes and dates are averages. Feeding and sleep notes follow widely published public-health guidance, including World Health Organization infant-feeding advice and back-to-sleep recommendations. They are not a protocol for your hospital.