Dose this make me selfish

I’ve been thinking of having another baby.! I have 5 kids my youngest is 6 months old and I love all my kids so much but I also feel selfish for wanting another when my little girl is only 6 months old.! All my kids are close in age and I love it that way but I just have this guilt for my little girl do any of you other mummy’s feel this guilt? I’m 36 so I’m not getting any younger too. I know people will be saying be grateful for the kids you have and I truly am I feel blessed but I just love having a big family