The seven-day maturity window
Why a Pal cannot be sold or traded for seven days after it hatches.
A Pal cannot be listed on the marketplace or included in a direct trade until seven days have passed since it hatched. The restriction is applied at hatch, runs continuously, and cannot be shortened.
What the window covers
During the window a Pal cannot be listed, cannot be named in a trade offer, and cannot be transferred by any other route.
Everything else is unaffected. The Pal appears in your collection, can be renamed, can carry an accessory, and can take part in a playdate.
Why it exists
The window exists to make referral farming unprofitable. Without it, an account could generate referrals for the sole purpose of hatching Pals and selling them immediately, which would put the value of the marketplace in the hands of whoever could open accounts fastest.
Seven days is also the period in which a referred account is most likely to be reversed by fraud review. Holding the Pal for that period means a Pal produced by a referral that is later found to be fraudulent has not yet been sold to another holder.
When a referral is reversed
If the referral that produced a Pal is reversed during the window, the Pal is removed from your collection and the 40 Treats credited for it are deducted.
Once the window has closed, a reversal deducts the Treats but does not remove the Pal. This is why the window exists rather than a longer clawback rule.
How it is measured
The window runs from the hatch timestamp, not from the start of the following day. A Pal that hatched at 14:30 becomes listable at 14:30 seven days later.
The remaining time is shown on the Pal's detail view, to the nearest hour.