What does a child development specialist do?

As new parents, we often have so many questions about our little ones’ growth and development. I’ve recently learned about child development specialists and I’m curious about their role. Are they mainly focused on helping us track developmental milestones, or do they also diagnose potential issues?

Living in Sydney, I’m considering whether it would be helpful to consult a specialist to support my child’s growth and learning at home. For those of you who have experience with child development specialists, what was your experience? How did they assist you in understanding your child’s unique needs?