Set your instant pot to “Sauté” mode. Add the olive oil, garlic, and onions. Cook for about 2 minutes until the onion has softened.
Add the celery, carrots, bay leaves, vegetable broth, rosemary and the 2 whole chicken breasts. Give it a good mix.
Close the lid, make sure the pressure valve is closed, set the instant pot to “Soup/Broth” mode, and select 10 minutes.
After the 10 minutes, let the pressure release naturally for about 15 minutes.
While you wait, boil some water and cook the noodles.
Carefully remove any remaining pressure and open the lid.
Transfer the 2 chicken breasts to a clean plate. Use two forks to shred the chicken, then transfer it back to the soup.
If your baby is < 12 months old, remove his/her quantity and adjust the salt and pepper for the rest of the family.
Add the noodles only to the soup that will beserved and refrigerate / freeze leftovers.