The phrase "are initially small" is correct and usable in written English.
It can be used to describe something that starts off at a small size or scale before potentially growing or changing.
Example: "The seeds are initially small, but with proper care, they can grow into large plants."
Alternatives: "start off small" or "begin as small".
But the savings from new plans are initially small, growing only over time.
The slippages of CFRP tendons are initially small but increase quickly with increasing load.
Solutions which are initially small in H1∩L1 R3) and inside a neighborhood of the first excited state family are shown to converge to either a first excited state or a ground state at time infinity.
Newborn amyloid plaques are initially small in size and grow over the following weeks.
In conclusion, newly appearing amyloid plaques are initially small in size but grow over time until plaque growth can not be detected anymore in aged mice.
Post-mortem analysis of plaque development in mouse models of AD revealed that plaques are initially small, but then increase in size and become more numerous with age.
We next establish an initial excess improvement estimate assuming that the excess Φ is initially small enough.
The death toll on the Israeli side is now rising after it was initially small.
What were initially small flickers of insects in the spotlight beam become a whipping cloud, then a full-on, whiteout blizzard.
The reason why the energy value is initially small is to highlight network performance bottlenecks in a short time, thus allowing to observe the event monitor performance with the passing of time.
It is even possible that the advantageous black will be completely eliminated by genetic drift, although this outcome is more likely in the early generations because the frequency of the advantageous black is initially small.
