What is 12months to 24months like?

The first year is such a rollercoaster, so many highs and lows (sleep regressions, teething, intense development) I really really enjoyed the first year despite some of the lows being REALLY low.

I guess now I’m wondering what is the second year of life like?

Is it more stable? Is it still a huge rollercoaster? Is it harder? Easier?