Infants need a lot of attention, but they are so cute around this time, aren't they?
Your little girl will keep you busy at this age, but she's also really cute right now, isn't she?
ーInfants need a lot of attention, but they are so cute around this time, aren't they?
「乳児は手がかかるけど、この時期はとても可愛い時期ですよね」
infants で「乳児・幼児」
to need a lot of attention「たくさんの注意が必要」＝「手がかかる」と表現できます。
around this time で「この時期」
ーYour little girl will keep you busy at this age, but she's also really cute right now, isn't she?
「この月齢のお子さんは手がかるけど、とても可愛い時期ですよね」
to keep you busy で「あなたを忙しくしておく」＝「手がかかる」を表現できます。
at this age で「この年齢・月齢の」
ご参考まで！
カナダ 
