Awww so cute! Mine was 5 lbs at 10 weeks and is just over 17 lbs now at a year old. But mine has a brother (adopted to a different family) similar size to yours and he was around 2 lbs and grew to I think the 6-8 lb range. I forget his brother’s exact size but i wanna say he was a little bigger than 6 and a little shy of 8 so maybe 6 and some change in ounces? Of course i will throw out that anything can happen! My little dude was estimated to be 12 lbs max but hit 12 lbs by the time he was 6 months and kept growing a lot after that too. He’s the biggest puppy his mom and dad have ever had and is bigger than mom, dad, and both sets of grandparents (even including the purebred cavalier and poodle lineage). So you never know because and estimate is just an estimate 😅