firstdays

noun
UK /ˈfɜːst deɪz/
US /ˈfɝːst deɪz/

The first days are the very beginning days of something new.

The first days of school are always exciting.


OTHER MEANINGS

2. The first days of a job, when someone is still learning.

She felt nervous during her first days at the office.

3. The first days of a season or month.

The first days of spring brought warm sunshine.

4. The first days of a baby's life.

The first days with a newborn are very busy.