Ay oo naman, totally normal yan! At 6 months, ang baby mo ay lumaki na quite a bit, kaya ang kicks mo ay mas malakas na at makikita mo sila kung nasaan exactly ang baby, kung nararamdaman mo lang sa lower abdomen, it probably means ang legs niya ay nandoon at playful, or baka head-down position na siya (which is actually a good sign!). My friend went through the same thing at 6 months and her OB said it's perfectly fine, walang alalahanin, normal lang ang movements doon. But syempre, best pa rin na i-mention mo sa doctor mo next visit para ma-confirm ang position niya and peace of mind mo, mas okay kung sure ka lang talaga, di ba?