Rio Olympics 2016: AWWdorable! Michael Phelps' son Boomer was a huge hit among spectators

United States' Michael Phelps' son Boomer wears ear protection during the swimming competitions at the 2016 Summer Olympics.

Boomer, the son of United States' Michael Phelps, sleeps on the shoulder of his mother Nicole Johnson as she leaves the hall after the men's 200-meter butterfly final during the swimming competitions at the 2016 Summer Olympics.

United States' Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly with his mother Debbie, fiance Nicole Johnson and baby Boomer during the swimming competitions at the 2016 Summer Olympics.

United States' Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly with his fiance Nicole Johnson and baby Boomer during the swimming competitions at the 2016 Summer Olympics.

United States' Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly with his mother Debbie, fiance Nicole Johnson and baby Boomer during the swimming competitions at the 2016 Summer Olympics.

United States' Michael Phelps is surrounded by media as he kisses his son Boomer, held by his fiancee Nicole Johnson, second left, after winning the gold medal in the men's 200-meter butterfly final during the swimming competitions at the 2016 Summer Olympics.

United States' Michael Phelps fiancee, Nicole Johnson, holds his baby son Boomer during the swimming competitions at the 2016 Summer Olympics.

Nicole Johnson, fiance of United States' Michael Phelps, holds their baby Boomer, as she stands with Phelps' mother Debbie during the men's 4 x 100-meter medley relay final during the swimming competitions at the 2016 Summer Olympics.

United States' Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly with his fiancee Nicole Johnson and baby Boomer during the swimming competitions at the 2016 Summer Olympics.

Nicole Johnson, fiance of United States' Michael Phelps, holds their baby Boomer, and takes a selfie along with Phelps' mother Debbie and others after the men's 4 x 100-meter medley relay final at the 2016 Summer Olympics.