I'm not into matching sibsets or misspellings, so I vote Chelsea
Exactly this. Why do your dd's need matching spellings?! Either choose a name that ends in ie (Tazie come to mind) or choose one of the two names you mentioned and spell them correctly.
I dislike both equally, but if there was like a gun to my head, I would begrudgingly go with Chelsea (spelled this way)... But first I might contemplate death.
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If you are set on spelling them with an ie, I'd go with Kelsie, since that's actually a spelling variant I've seen before and Chelsie looks bizarre to me. While NMS, if you're going for similar sound with your kids, you don't necessarily need the exact same spelling too, and either Chelsea or Kelsey would work.
Chelsie looks as if you wanted to name your child Chelsea but did not know how to spell it. I agree with pp's if you must have matchy names pick one with a legit "ie" ending.
Re: Chelsie vs Kelsie
Loss #6 2014 Loss #7 (chemical) 2014
~DS Born! 2009~
~DD Born! 2013~
Another for Chelsea...spelled correctly.
First round of Clomid in May 2012= BFP #1, DD born January 2013
BFP #2 in January 2014, DS born September 2014
1) It is setting her daughter up for a lifetime of headaches; no one will ever default to that spelling.
2) It's juvenile; she can dot the I with a heart! SQUEEEEEEEEEEEE!!!!!!!!!