Im going to be honest with you..Lady is 14 months old and weighs in at 2lbs.We have trouble with her keeping her weight up and she has been on high calorie food for the past 4 months to maintain her weight,because as soon as we take her off of the high calorie food,her weight goes down to 1lb 10oz (more or less).When they are so tiny,it IS a problem.But not only because of how fast they can deteriorate when and if they are ill,its also because of how extremly fragile they are.Lady cant get up onto furniture,she cant get down,and we have to be so careful when we are around the house so that she doesnt get stepped on etc,we also have to keep an eye on her sugar level (make sure she eats) because the tiny ones never grow out of hypoglycemic attacks,so even at a year old it can still happen..it is infact a huge responsabilty when they are very small.
Jess,my youngest yorkie,is 8 months old and weighs in at 8lbīs..now she is so much "easier" to have

We are more laid back with her because she can hold her own and she is SO much bigger and stronger.She eats wonderfully and we dont have to count the kibble to make sure shes had enough..its just a whole different story.
What ever the size of your baby,after 24hours you wont even notice because you will be head over heels inlove

It wont matter one bit how big or small they are