Gu Gu and Gor Gor

On the 1st Sep, Carys Tan Enxi call "Gor Gor (哥哥）clearly for the 1st time. 1st Nov, Carys Tan Enxi call "Gu Gu (姑姑）clearly for the 1st time. I guess it's difficult to pronounce 'g' sound for young kid. She has no problem calling 'pa pa' and 'ma ma'.