Ive read in books that if you baby is preterm (my DD was born at 36 weeks) that when looking at the 'normal' development milestones, you need to determine the dates using their original EDD not the date they were born - Im interested to know whether people with preterm babies have experienced this? .. particularly with growth spurts - my DD is now 6 weeks and I am pretty sure she is going through the classic 6 week growth spurt - but does this also get delayed ie am I really only in week 2?? Also sleeping through the night - did this happen later? Thanks