i was personally very cautious about letting mine outside when they were babies...unless they were in my bag and going somewhere where they would have limited or no contact with other dogs, i left them at home snuggled into their beds...my vet also said i should wait to take them for walks until they had their shots...when they are this little, running around the house is plenty of exercise and it tires them out quick
and this did not cause any socialization issues with miss b or bentley...they both love other dogs and will go up and sniff one that is 10 times their size lol
just my opinion of course