my boy is 5 months 11 days,he is on formula and bm. I hav been giving 3-4 times formula and rest bym, but these days he is not taking milk through bottle. he just wants glass or cup to drink milk.but if give him milk through glass it spills out alot and his feeding Amt of milk reduced WT can I do that he may take milk from bottle or feeding through glass is fine at this stage..