
Puppies should be wormed for the first time by the breeder at around 3 weeks of age, as the worms they will have had passed to them across the4ir mothers placenta will be mature at this stqage and need to be got rid of.
Then depending on what product is used (some kill only adult worms, but the more expensive modern ones kill larval stages too) then they will need doing every 2 to four weeks until 12 weeks of age, and then monthly until 6 months of age, and then every three to 6 months as adults.
A friend of mine recently rescued a whole litter of GSD pups from a drug adict at 6 weeks old. Well rescued is the wrong word, she had to buy them!!!
These pups Mum had never been wormed, and the pups had not been either. they were running aliove with fleas, which they treated with Frontline spray pdq.
When she got them home they were pot bellied and rather quiet. The rescue she has contacts in supplied her with Panacur Wormer and she proceeded to do the 3 day worimg course. On the second day they were passing and vomiting up worms, and they continued to have loose stools for several days. A Vet check revealed that they were anamic due to the heavy worm burden, and this had also caused the problem with the stools. She fed them increasing amounts of food as their appetites increased, and also gave them each a tablespoon of LIVE natural yogurt, to help with the tummy problem. One little bitch was poorly and nearly died. They were homed at 8 to 10 weeks old after a lot of hard work, by which time their coats shone, the4ir eyes sparkled and they were lovely looking pups, and thankfully seem to have excellent temperament (luck not design of the original breeder).
What I am trying to say is that it is possible to turn a pup around that has had a poor start BUT YOU SHOULDN'T HAVE TO. You swhould have bought a pup from a carefully planned litter, from a knowledgeable breeder who will have been there with help at every turn for the rest of the dogs life. You would then likely have had a well adjusted fit pup with only the change of home to cope with, and probably none of these health concerns.
This puppy is going to need a lot of TLC and Time, and you will shortly find it very difficu7lt to cope with a demanding puppy and a new baby. It can be done, but you are going to be one very worn out person for the next two years. By then if you persevere the pup should be a well mannered adult just starting to get sensible by the time the baby starts to be more of a handful. You will then have to watch that the toddler/child respects the dogt, and does not te4ase etc, and alwasy supervise them together, and then they should continue to have a good relationship, and by the time baby is school age the dog will be loyal freind and protector.