First Trimester

The first trimester starts on the first day of your last period and runs through weeks 1 to 13 of pregnancy. During this time, your baby grows from a tiny cluster of cells to the size of a plum.

Pregnancy Week 1Preparing for conception

Pregnancy Week 2Ovulation

Pregnancy Week 3Egg fertilisation happens

Pregnancy Week 4Baby is growing inside you

Pregnancy Week 5Baby looks like a tadpole

Pregnancy Week 6Baby is size of a sesame seed

Pregnancy Week 7Baby's brain develops

Pregnancy Week 8Baby's hands appear

Pregnancy Week 9Baby responds to touch

Pregnancy Week 10Tongue is fully formed

Pregnancy Week 11Fingernails and hair appear

Pregnancy Week 12Baby can open it's mouth

Pregnancy Week 13Vocal cords form