A Swiss-based relief worker who met with Lech Walesa reported yesterday that the interned leader of the suspended Solidarity labor movement is living in comfort, has gained weight and his famous drooping moustache has been lost in a full beard.

Zdzislaw Pregowski, the first person other than family members and church officials to see Walesa, said after his return to Geneva that he met with Walesa for four hours at a villa in Otwock, south of Warsaw, on March 10. He said Walesa had several rooms at his disposal but six guards were posted outside. Walesa greeted Pregowski by saying: " 'As you can see, I'm living in a golden cage,' " the official, representing a group called "Poland in Need," said.

Walesa's priest, the Rev. Henryk Jankowski, said that the christening of Walesa's daughter, Maria Victoria, born Jan. 27, would go forward Sunday in Gdansk, no matter whether the labor leader would be allowed to attend. Jankowski said that Walesa will probably not be allowed to be present. All requests by foreign correspondents to travel to Gdansk this weekend have been rejected.

Meanwhile, the Polish government's official press spokesman, Jerzy Urban, was criticized in the liberal Communist weekly Polityka for his alleged blanket condemnation of Solidarity and wholehearted support of martial law. The attack was believed to be the sharpest criticism of a ranking Communist official in the heavily censored press since the country was put under martial law Dec. 13.