Children's centres in Norwood Green and Heston have been told to do more to help overweight youngsters shape up.
The Norwood Green and Heston Cluster, based at Berkeley Primary School, in Cranford Lane, Heston, was rated 'requires improvement' by Ofsted inspectors - the second lowest of four bands.
Inspectors said the centres offered families tips on how to lead a healthier lifestyle but these had only a 'limited impact' on reducing the proportion of overweight children, which is above the national average.
The report, published following a visit at the end of September, is the first since the two centres were lumped together under a borough-wide shake-up of children's centres in 2012.
Inspectors also said too few of the families most in need were using the services available and the progress of those who did attend was not properly tracked.
However, they said leaders had a good knowledge of the local community and families enjoyed the 'warm and friendly atmosphere' at the centres, which parents said had helped them make friends.
Children's centres support families with children aged under five, offering everything from play sessions for the youngsters to health and careers advice for their parents.
Councillor Tom Bruce, Hounslow's cabinet member for education, said: "The council has already started to address a number of the issues raised by Ofsted and will continue to work on its action plans to ensure that at the next full inspection the cluster will be judged ‘good’ or ‘outstanding’. We give our full support to the centre manager and staff in their quest to improve."
Although the centres are based at Berkeley Primary School they are not connected to the school, which was rated 'outstanding' by Ofsted earlier this year.