The world's first test-tube baby, Louise Brown, celebrated her 10th birthday and announced "I'm a test-tube big girl now."

The girl who was dubbed "the miracle baby" when she was born at 11:47 p.m. July 25, 1978, marked her birthday Monday with her parents John and Lesley Brown and young friends at her Bristol home in west England.Since she was born, more than 1,000 other babies in Britain alone have been conceived by the same method of in vitro fertilization - that is, fertilizing a human egg in a test tube or laboratory dish, then implanting it in the mother's womb to develop normally.

Does Louise feel any different from other children?

"Only sometimes," she told the Sunday Mirror newspaper. "We sing a hymn at school. It goes `Thank you God for miracles of science.' When I sing it, I feel a bit funny. It's the word people use about me."

The technique was the fruit of research by British doctors Patrick Steptoe, who died earlier this year, and Robert Edwards.

Louise blew out the 10 candles on her birthday cake with a little help from her little sister Natalie - also a test-tube baby.