Baby monitor - how long to continue ?

RAS • Mommy to Mila Rose 9-2-18 & Isla Lily 03-21-20 🎀💗🙏🏻

When do you stop using the baby monitor ? We still have it for my 21 month old. we are looking to move and by that time we hope to have my 3 month old in her own crib and room and get a toddler bed for my first. Do most people by a second monitor ? Thanks