Mummies is 2month plus going 3months babies suitable to be babywear in a normal carrier without infant insert ?

It will be better to continue using the infant insert as baby at 3 months old will not have strong neck control to hold their heads up and they may sink into the carrier as they are not tall enough, it can risk Sudden Infant Death. Also, baby legs may not be long enough to sit knee to knee nicely. Hyperextended legs can lead to injuries. Left is hyperextended legs, right is correct knee to knee.