English to Polish Medical Medical (general) rozwój niemowląt

Fragment podręcznika z zakresu pediatrii.
X scale may be used to assess the motor skills of those infants whose patterns of movement are essentially normal but who exhibit slow or immaturemotor development.
I jeszcze "Despite these limitations, these infants demonstrate normal patterns of movement, differentiating them from infants with more severe motor impairments who exhibit abnormal components of movement, such as infants with spina bifida or those with cerebral palsy"

Oczywiście wiadomo, co to znaczy :), ale jak to ładnie ująć w słowa?

Z góry uprzejmie dziękuję :)