Double eyelid

my girl #1 born without eyelid, at 1.5yo one of her eye suddenly have eyelid, and it makes one of the eye bigger than the other one, I know it's bcos of the eyelid, but the teacher and PD told me to check to eye specialist for lazy eye (cos when she's very tired the imbalance eyes looks very obvious), so I did, and turn out she didn't have lazy eye or other eye problem. Until about 4yo suddenly the other eye have eyelid also and finally her eye now looks better. my #2 born with eyelid, but after few months both eyelids disappear, just cross my finger and hoping that it will show again after she grow bigger ☺️