when is the fetus most affected by teratogens
4-8 weeks
when is the spinal cord formed?
4 weeks
when is the heart fully developed?
8 weeks
when do the kidneys secrete urine?
12 weeks
when is the heart audible by doppler? stethoscope?
12 weeks, 16
when does the fetus begin to practice sucking
16 weeks
when can sex be determined by ultrasound?
16 weeks but most don’t get ultrasounds until 20 weeks
when should FM be felt by mother?
20 weeks
age of viability
24 weeks
when does surfactant begin to form?
24 weeks
when does the actual sucking & swallowing reflex begin
32 weeks
when is the GI tract mature?
36 weeks