The Hammers had not played at home since the 0-0 draw with Brighton and Hove Albion on the 26th September and made a welcome return to their newly-adopted home ground.
An own goal and an Ashley Fletcher header were enough to secure all three points.
Martin Samuelsen returned to the side after being on loan at Blackburn Rovers this season but did not feature regularly for the Lancashire side.
Goal scorer Fletcher appeared on the bench for the first team at the weekend against Everton before making his third Premier League 2 start of the year.
It took just eight minutes for West Ham to take the lead. Moses Makasi was fouled and the resulting free-kick was crossed in and fell to Ashley Fletcher, who did brilliantly to turn in the area and his powerful cross was turned home by West Brom’s Jack Fitzwater.
The young Hammers could have doubled their lead soon after, but Samuelsen’s flick from Marcus Browne’s corner was wide of the mark
A heated exchange after 24 minutes between Browne and Shaun Donnellan saw both players receive yellow cards.
James Smith tried to equalise for the visitors but he sliced his volley, and then had a shot well held by Hammers goalkeeper Sam Howes.
Crossbars and Goals
With just over a half hour on the clock, Fletcher doubled the hammers lead with a bullet header following a pinpoint cross from Jonathan Calleri.
Terry Westley’s team nearly extended the lead even further after Browne’s shot smacked the crossbar. Declan Rice was also unlucky not to score after his side-footed volley was saved well by Jack Rose.
After the interval, West Ham had more chances, with Calleri firing straight at the goalkeeper in the 52nd minute. Browne then blew a great opportunity to make it 3-0 when his shot was saved from close range. The young Englishman will be disappointed not to get on the score-sheet.
There was a consolation goal for the Baggies in the closing stages. Dara O’Shea’s thumping strike in the 93rd minute gave West Ham a scare, but there was nothing Howes could do to keep out the powerful strike.
The result moved the Irons into 2nd place in the Premier League 2 table, keeping them well in the mix for promotion to the top tier.
LINE UP:West Ham United: Howes, Westley (Sylvestre, 69), Pike, Rice (c), Neufville, Quina, Makasi, Samuelsen, Browne (Kemp, 80), Fletcher, Calleri (Hector-Ingram, 90).
SUBS: Matrevics, Akinola.
GOALS: Fitzwater (OG), Fletcher