Baby Development Timeline – Ninemonths.com.au

0-3 Weeks

Pregnancy is dated from the first day of the last menstrual period. This is an old convention still in place …

Conception On its arrival, it becomes known as a blastocyst and floats freely within the womb cavity for about three …

Spinal Cord Your baby’s spinal cord and the brain are now almost complete and the head is beginning to look …

Foetus Your baby, now called a foetus, has obvious elbows, wrists, ankles and clearly visible fingers and toes. It measures …

Genitals Your baby’s genital swelling becomes a penis or clitoris. Its neck elongates and the head raises up, looking more …

Transparent Skin Your baby may now measure 15cm and weigh up to 125 grams. Its legs are now longer than …

Thumb Sucking Your baby can suck its thumb and now has a wide range of movements and co-ordination. Weighing about …

Life Cycle The cycle of life begins early. A girl baby will already have about seven million eggs in her …

Heartbeat The baby’s bone centres are beginning to harden and thousands of tiny veins are now clearly visible through the …

Brain The last trimester is a crucial time for brain development. As the brain mass increases, the tissue folds into …