How would I say a toddler is 2 years and 7 months old correctly? Is this right:
It is a two-year-seven-month-old toddler.
Or do I need an “and” between? I personally think hyphenating here looks ridiculous. In formal English, say a report document about child behaviour or whatever, could I write
It is a two year, seven month old toddler
instead, too?