  Motivated by the notions of $k$-extendability and complete extendability of
the state of a finite level quantum system as described by Doherty et al (Phys.
Rev. A, 69:022308), we introduce parallel definitions in the context of
Gaussian states and using only properties of their covariance matrices derive
necessary and sufficient conditions for their complete extendability. It turns
out that the complete extendability property is equivalent to the separability
property of a bipartite Gaussian state.
  Following the proof of quantum de Finetti theorem as outlined in Hudson and
Moody (Z. Wahrscheinlichkeitstheorie und Verw. Gebiete, 33(4):343--351), we
show that separability is equivalent to complete extendability for a state in a
bipartite Hilbert space where at least one of which is of dimension greater
than 2. This, in particular, extends the result of Fannes, Lewis, and Verbeure
(Lett. Math. Phys. 15(3): 255--260) to the case of an infinite dimensional
Hilbert space whose C* algebra of all bounded operators is not separable.
