If puppies can not be kept with their mother for some reason, for example if she develops mastitis or
eclampsia then milk replacements fed via bottles should assist you in aiding the puppy / puppies to feed adequately.
I was fairly young, the first of our group of friends to start a family and I had my fair share of anxious moments in pregnancy to deal with first from hideous morning (all day) sickness until I was 20 weeks pregnant
then blood pressure that would shoot up and down, I measured far bigger than expected and had the beginnings of pre
eclampsia.