My little piglet

Today I took Dolly to the doctor for a weigh-in and check-up.  She weighed 8 lbs, 4 ounces - up from her weight of 7 lbs two weeks ago and her birth weight of 5 lbs and 16 ounces. The pediatrician said she must be eating like a little piggy!  Well, she does like to eat a lot. So I got to ask all my questions including, how old is she really? Dolly was born 4 weeks early.  Technically she is 6 weeks old but her corrected age (based on her due date) is 2 weeks. So is she 6 weeks or 2 weeks old?  According to the doctor, Dolly is only 2 weeks old, like a newborn for everything developmentally including sleeping and eating.  However, for vaccinations, Dolly is 6 weeks old and will receive her first vaccines in 2 weeks.  Hmm.  All the books I have been re-reading (that I used with Mister) say that sleep routines don't really begin until 6 weeks .. that's why I was asking. So I guess I have another month of irregularity and non-sleeping. She does like to eat a lot! By the way, I asked about RSV season.  It lasts until March but December and January are the worst months.