word count

hiii ya’ll. just wondering where your littles are at with speaking? Our guy was born Dec 31 - so he’s 16.5 months & only intentionally saying mama/papa. He babbles/chatters all day long. Understands and engages when we talk to him. He signs (please, more, milk etc.) ... but our oldest knew all animal sounds and would attempt at words at this age. Trying not to compare my boys or him with other kids- but I’m worried our little is delayed a bit with no interest in words!