Issued in 2019, this set of 4 stamps takes a look at Tyrannosaurus rex. Two of the stamps incorporate lenticulate technology, so look different when you turn them.
Mom T rex
And child on the 2nd stamp, and on the back of the envelope.
You can see one of the other envelopes I sent at Eva's blog.
For (presumably) more traditional mother and child stamps, explore the links at Sunday Stamps.