Baker was first capped for Wales on 6 February 1909 when he played against Scotland at Inverleith, under the captaincy of Billy Trew.

Wales beat France 47–5 in a one sided game in Paris, with Baker running in a hat-trick of tries.

Wales won the Grand Slam that year but Baker was not part of the first game of the next season's tournament.

In 1910 Baker was offered a place on the British Isles tour of South Africa under the captaincy of Newport's Tommy Smyth.

Baker managed to play in only one of the three test games, but decided to stay in South Africa after the end of the tour.