Baby Cries At Infant Care

Hi my baby is turning 1 year old soon. She's been in infant care for more than 3 months but everyday I send her she will cry and cling to me. My heart breaks to see it everyday. I try to reassure her that it's OK and I will pick her up soon but I don't think she can understand it yet. Does your baby also cry like that or is my girl too clingy? What can I do?