There are no direct antonyms for the medical condition "Infantile Cortical Hyperostoses" (ICH), which is a rare genetic disorder that affects bone growth in infants. However, a broader way to approach this question is to look for words that represent the opposite characteristics or symptoms of ICH. For example, words such as "normal," "healthy," "unaffected," and "adequate" can be used to indicate the absence of abnormal bone growth in infants. Conversely, words such as "abnormal," "atypical," "pathological," and "deficient" can represent the opposite of normal bone development in infants, which is a characteristic of ICH.