Car seat questions

Mama of 3 • Wife & Mama of 3 ASD supporter 🧩 2 princes🤴 1 princess 👸🏻 Coffee ALWAYS ☕️

My son is almost 1 and he is still currently on his infant seat. He has the graco snug ride snuglock system. My son is tiny he’s not even 20lbs and just about 27 inches tall. My question is should I consider getting him a toddler seat since he’s almost 1 or wait until he’s bigger and switch then.