14 Do all premature babies have a low weight at birth? In most cases, premature babies are born with low birth weight. This can be because a baby’s growth in the womb is closely related to the duration of the pregnancy. This is another reason that most preterm babies are likely to be smaller in size. However, there are exceptions. For example, a 34-week-old preterm baby weighing 2.5 kg is considered premature but not low birth weight. Given below is a classification of the degree of prematurity based on the weeks of pregnancy. Categories Weeks of Pregnancy Extreme preterm 24 weeks to 28 weeks Moderate preterm 28+1 weeks to 32 weeks Early preterm 32+1 weeks to 33+6 weeks Late preterm 34+0 weeks to 36+6 weeks Full-term 37 weeks to 42 weeks Post-term More than 42 weeks
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