  The role of magnetic field decay in normal radio pulsars is still debated. In
this paper we present results which demonstrate that an episode of magnetic
field decay in hot young neutron stars can explain anomalous values of braking
indices recently measured for more than a dozen of sources. It is enough to
have few tens of per cent of such hot NSs in the total population to explain
observables. Relatively rapid decay operates at ages
$\lesssim$~few~$\times100$~kyrs with a characteristic timescale of a similar
value. We speculate that this decay can be related to electron scattering off
phonons in neutron star crusts. This type of decay saturates as a neutron star
cools down. Later on, a much slower decay due to crustal impurities dominates.
Finally, we demonstrate that this result is in agreement with our early
studies.
