Here's that search without "Sweet": https://books.google.com/ngrams/graph?content=summer+child%2C+summer%27s+child&year_start=1800&year_end=2019&corpus=26&smoot

Here's that search without "Sweet": https://books.google.com/ngrams/graph?content=summer+child%2C+summer%27s+child&year_start=1800&year_end=2019&corpus=26&smoothing=0&direct_url=t1%3B%2Csummer%20child%3B%2Cc0%3B.t1%3B%2Csummer%20%27s%20child%3B%2Cc0 https://books.google.com/ngrams/graph?content=summer+child%2...