@jackerbee4 I love this one because it's only one drop. I'm based in the UK but I'm pretty sure I had something like this for my first as well when we were stateside.
Baby Ddrops 10 µg 60 Drops - Daily Vitamin D3 Supplement for Infants and Young Children - Supports Teeth & Bone Health - No Preservatives, No Taste, Non-GMO, Allergy-Friendly. https://amzn.eu/d/7pFs2WC
@jackerbee4 We like the Zarbee’s brand. It’s dispensed via a little syringe that you draw up a tiny .25ml dose.
We got really frustrated with the Ddrops where you shake to get the drop out, and it doesn’t always land in baby’s mouth, or it’s hard to get out, etc.