Spinal Cord Your baby’s spinal cord and the brain are now almost complete and the head is beginning to look more human-like. Measuring about 1.3cm long, its limb buds have grown into tiny arms and legs with small ridges that will develop into fingers and toes.
Thumb Sucking Your baby can suck its thumb and now has a wide range of movements and co-ordination. Weighing about 280 grams, its dental development continues as the buds for permanent teeth are already forming behind its milk teeth.
Brain The last trimester is a crucial time for brain development. As the brain mass increases, the tissue folds into its characteristic walnut-like appearance.