Also..you may find that proportionately for size..a newf requires a lot less food than a lab..so you may be expecting him to eat more than he actually NEEDS.
Congratulations!!! So glad you waited through it all. Debra is right - you have around 3 weeks before you start seeing normal behaviors, including eating.
Archie looks like such a love! And, I think all of us completely understand the feeling of being near tears fearing for one's Newf. I do it all the time - and they're HEALTHY for the most part!! I'm such a wuss!