@ashia22May 24.2018 — #Yes, it's common idea that "sandbox" term stays 3 month for a new site. Please note that this term starts not from domain registration date (IMO, Google usually doesn't use WHOIS dates at all) but from the date of first GoogleBot crawl.
@efusionworldMay 26.2018 — #Google sandbox effect will be there from 1 to 6 months for a new website. just forget it and publish the unique articles on a regular basis. Make sure Google spider is indexing your every page after publishing.