@Victoria makes sense
Once lo turns 2, I'll go by every 6 months....2and a half.. When lo turned 1, I said 1 year old. But then a month later I said 13 months. You're right, every month they develop so fast..so many changes.
Once they're 2, I just go by years.
I switch based on who I’m talking to/context. Most men I say 1 or 1/2 most other moms I say months
I’m the same as @Daija
24 months
I go by the rules of 2. Hours until 2 days old, weeks until 2 months old, months until 2 years old. So I'll switch to years once she's 2.