  We present near-infrared (NIR) observations of Nova V5668 Sgr, discovered in
outburst on 2015 March 15.634 UT, between 2d to 107d after outburst. NIR
spectral features are used to classify it as a FeII class of nova. The spectra
follow the evolution of the spectral lines from a P Cygni stage to a pure
emission phase where the shape of the profiles suggests the presence of a
bipolar flow. A notable feature is the presence of carbon monoxide first
overtone bands which are seen in emission. The CO emission is modeled to make
estimates of the mass, temperature and column density to be (0.5--2.0)$\times$
10$^{-8}$ M$_\odot$, 4000 $\pm$ 300K and (0.36--1.94)$\times$ 10$^{19}$
cm$^{-2}$ respectively. The $^{12}$C/$^{13}$C ratio is estimated to be $\sim$
1.5. V5668 Sgr was a strong dust producer exhibiting the classical deep dip in
its optical light curve during dust formation. Analysis of the dust SED yields
a dust mass of 2.7 $\times$ 10${^{\rm -7}}$ $M_\odot $, a blackbody angular
diameter of the dust shell of 42 mas and a distance estimate to the nova of
1.54 kpc which agrees with estimates made from MMRD relations.
